Key takeaways
- The appeal of a Ninja stay-sharp knife set is simple: the sharpener lives with the knives.
The appeal of a Ninja stay-sharp knife set is simple: the sharpener lives with the knives. Instead of owning a whetstone you never use, the block has a built-in or removable sharpening system, and the titles promise blades that stay sharp for 10 years or more. That is the marketing claim, and it is worth reading as exactly that, a manufacturer statement rather than something this guide has measured. What you can compare on paper is the piece count, the steel, and the sharpener design.
This roundup is for home cooks who want a one-box solution with minimal maintenance and who are choosing between the NeverDull block sets, the compact space-saving versions, and the six-piece StaySharp starter. If you are shopping in 2026 and cannot decide between a 6, 9, 10, 11, 12, or 17-piece lineup, the sections below explain what each size actually gives you, judged only from the product titles.
Quick Picks
Our top picks
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
| Product | Best for | Key spec from the title |
|---|---|---|
| Ninja NeverDull 10-Piece (Bone and Champagne) | Style-minded cooks who want a removable sharpener | Premium German steel, removable sharpener |
| Ninja Space Saving 10-Piece Block (NK32010) | Small counters | Sharpen on or off the block, rust-resistant blades |
| Ninja 17-Piece Block Set (K32017) | Large households that cook daily | Built-in sharpener, German stainless steel, 17 pieces |
| Ninja Premium 11-Piece (WK62011) | Customizing the countertop layout | Removable sharpener, smaller footprint without it |
| Ninja Foodi NeverDull 12-Piece (K32012) | Mid-size kitchens wanting a premium system | 12 pieces, built-in sharpener, German stainless |
| Ninja StaySharp 6-Piece (K62006) | Starter kitchens | Integrated sharpener; chef, bread, paring, scissors |
| Ninja Foodi NeverDull 9-Piece (K32009) | Smaller families wanting a built-in sharpener | 9 pieces, built-in sharpener, German stainless |
How to Choose
Understand how the sharpener is built
Two designs appear in the titles. Built-in sharpeners are part of the block itself, so the sharpening slot is always at hand. Removable sharpeners can be taken off so the block shrinks, then reattached when needed. If counter depth is tight, the removable style gives more control over footprint. If convenience wins, built-in is simpler.
Match piece count to your real cooking
Six pieces cover a chef knife, bread knife, paring knife, and scissors. Nine to twelve usually add a santoku, utility knife, and steak knives. At 17 pieces the extras are mostly steak knives and duplicates. A couple that cooks at home three nights a week rarely needs more than nine. A self-sharpening block is also forgiving for households where nobody wants to learn stone sharpening, and if several people cook, a block with a clear slot for every blade stops knives drifting back into the drawer unsheathed.
Treat the 10-year claim with realism
“Stays sharp 10+ years” is a manufacturer promise tied to the sharpening system. Edges still wear, and a self-sharpening block removes metal each time. Look at warranty wording on the seller’s page, use the sharpener as directed, and keep blades off glass or stone boards.
Check the steel and rust claims
Several titles list German stainless steel and rust-resistant blades. That is a good baseline for home use. What to ignore is color and finish names like Cyberspace or Nautical Navy, which change looks but not the cutting. Budget sets often cut corners on handle attachment, so look for full builds in the description.
The 7 Best Options
Ninja NeverDull 10-Piece Knife Set
This ten-piece set is described in the title as premium German steel with a removable sharpener, finished in a bone and champagne color scheme. It is aimed at cooks who care how the countertop looks, since the removable sharpener lets the block slim down when you are not sharpening. Among the ten-piece options it is the one that leans on a distinctive color palette, so it will appeal to buyers matching a kitchen scheme as much as a spec sheet. The two ten-piece blocks share a count, which makes finish and footprint the deciding factors.
- Strength: Removable sharpener gives flexibility over counter footprint.
- Strength: Ten pieces cover everyday prep and some extras.
- Trade-off: The 10-year sharpness line is a manufacturer claim you cannot verify from the listing alone.
Skip it if you want a darker finish or a larger count for a big household.
Ninja Space Saving 10-Piece Knife Block Set
The Space Saving set shares the ten-piece count but is described as sharpening on or off the block, using the removable NeverDull technology. The model in the Cyberspace finish suits small kitchens where every inch of counter matters, and the title stresses rust-resistant blades that stay sharp for 10 years or more. The fact that the sharpener works both on and off the block means you can keep the block slim on a daily basis and attach the sharpening piece only when edges need attention. Cooks in studio apartments or galley kitchens tend to value that kind of flexibility most.
- Strength: Flexible sharpener placement helps in cramped spaces.
- Strength: Rust-resistant blades reduce worry about moisture.
- Trade-off: Ten pieces is more than a single cook might use daily.
Skip it if you prefer a fixed, built-in sharpener that never needs reattaching.
Ninja 17-Piece Knife Block Set
At 17 pieces, this is the largest lineup in the group, with a built-in sharpener and rust-resistant German stainless steel. It suits big families, shared houses, or anyone who entertains and wants steak knives alongside the core blades. The title also highlights rust-resistant German stainless steel and the NeverDull technology, which means the sharpening system is the main differentiator from ordinary large block sets. For a family that has been replacing mismatched knives one at a time, a single large purchase can simplify the whole drawer.
- Strength: Largest count means steak knives and extras are included.
- Strength: Built-in sharpener keeps maintenance within the block.
- Trade-off: The big block takes the most counter space of any option here.
Skip it if you are short on counter room or rarely cook for more than two people.
Ninja Premium 11-Piece Knife Set
The Premium 11-piece set with a removable sharpener is described as customizable for the countertop, with a footprint about 45 percent smaller when the sharpener is left off, according to the title. It arrives in colors such as Nautical Navy and Forest Sage, which helps it stand out in a styled kitchen. The wording suggests Ninja designed the block to look cleaner without the sharpener attached, so it is a good fit for cooks who sharpen occasionally rather than daily. The trade is easy to state: more design flexibility in exchange for one more part to manage and store.
- Strength: Removable sharpener lets you shrink the block when you want.
- Strength: Eleven pieces sit between the nine- and twelve-piece versions.
- Trade-off: Color choices change the look only, not the cutting performance.
Skip it if you want a built-in sharpener that is always ready.
Ninja Foodi NeverDull 12-Piece Knife System
This twelve-piece system pairs German stainless knives with a built-in sharpener in a black block, labeled a Premium Knife System. It makes sense for a household that wants more than nine pieces without jumping to 17, and who prefers the sharpener permanently integrated. Because the title calls it a system rather than just a set, the pitch is that blades, block, and sharpening technology are designed to work together. It is an easy middle path between the compact nine-piece and the sprawling seventeen-piece block.
- Strength: Built-in sharpener simplifies upkeep.
- Strength: Twelve pieces offer a solid mid-size selection.
- Trade-off: Larger block than the compact 9- and 10-piece options.
Skip it if you want a removable sharpener or the smallest footprint possible.
Ninja StaySharp 6-Piece Knife Set
The six-piece StaySharp set pairs a chef knife, bread knife, paring knife, and kitchen scissors with an integrated sharpener, in white. It is the starter choice for a first apartment or a second kitchen, where six well-chosen pieces beat a block of seventeen. The scissors are a practical inclusion for opening packaging and trimming herbs, tasks that otherwise wear down a good knife edge.
- Strength: Integrated sharpener in a compact set.
- Strength: Covers the core knives plus scissors.
- Trade-off: No steak knives or santoku in the listed pieces.
Skip it if you need a bigger lineup or plan to host dinners.
Ninja Foodi NeverDull 9-Piece Knife System
The nine-piece system is the smaller sibling of the twelve-piece, with the same built-in sharpener and German stainless steel. It fits couples and small families who want the NeverDull approach without a crowded block. Nine pieces typically gives room for the core chef, bread, and paring knives plus a few extras, and the shared design with the twelve-piece version means the choice comes down to how many extra blades you will genuinely reach for. It is a sensible default for most households.
- Strength: Built-in sharpener with a modest block size.
- Strength: Nine pieces cover everyday cooking comfortably.
- Trade-off: Fewer pieces than the 12 and 17-piece options for entertaining.
Skip it if you want a removable sharpener or a larger set.
Which One Fits Your Situation
You cook for a big household
The Ninja 17-Piece Block Set gives the most knives, including extras, in one purchase. With many hands in the kitchen, having a dedicated slot for every blade also keeps the drawer from filling with loose edges, and a built-in sharpener means no one has to own a separate stone.
Your counter is tiny
The Space Saving 10-Piece or the Premium 11-Piece lets you remove the sharpener and reduce the block footprint. Both titles stress the smaller profile, so these are the two to compare if you are measuring a narrow stretch of counter beside the stove or under a wall cabinet.
You are furnishing a first kitchen
The StaySharp 6-Piece covers the essentials plus scissors with an integrated sharpener. It is the easiest set here to justify when you are still learning what you actually cook, since you can add a specialty knife later without having paid for a dozen blades you never touch.
You want the sharpener always attached
The Foodi NeverDull 9-Piece or 12-Piece keeps everything in one block without removable parts. Choose the nine if two people cook, and the twelve if you regularly set the table with steak knives.
Common Mistakes
- Believing “stays sharp 10+ years” means no maintenance ever.
- Paying for a 17-piece block and never using the extra steak knives.
- Choosing by color instead of sharpener type and counter footprint.
- Cutting on glass, stone, or ceramic boards that dull edges fast.
- Assuming every Ninja block sharpens the same way; built-in and removable designs differ.
Sharpener Upkeep and Knife Care
A built-in sharpener reduces effort, but it does not remove maintenance. These habits matter even more with a block that sharpens on its own.
- Use the sharpening slot only when a blade struggles with a tomato skin or a sheet of paper, not after every meal. Pulling a blade through abrasive slots removes metal each time, so frequent use shortens the life of the knife.
- Clean the slots occasionally. Food residue and metal dust can collect inside, and a soft brush or a puff of compressed air clears them without damaging anything.
- Wash knives by hand and dry them immediately before returning them to the block. Moisture trapped in a slot is the usual cause of spotting, even on stainless steel.
- Cut on wood or soft plastic boards. Glass, stone, and ceramic plates dull an edge faster than any sharpener can restore it.
- Keep the block away from the sink splash zone, since a damp block holds humidity against the steel for hours.
Specs and Terms Explained
Honing versus sharpening
Honing realigns a bent edge and removes very little steel, while sharpening grinds a new edge. Many integrated systems do a bit of both, so read the product description to see whether the slot hones, grinds, or offers two stages. A two-stage design is the more flexible one, because you can touch up lightly most weeks and grind only when a knife is truly dull.
Full tang
This means the steel runs the full length of the handle. It usually gives better balance and a sturdier feel for heavy chopping. Smaller utility and paring knives often skip it without any practical drawback, so do not rule out a set just because every blade is not full tang.
Serrated versus straight edge
Serrated blades slice bread and tomatoes for a long time without attention, while straight edges are the ones a sharpener actually maintains. A set with only one serrated knife is normal and not a flaw. If the sharpener slot is built for straight blades, the serrated knife will need separate care.
Which One Should You Buy?
| If you… | Choose… |
|---|---|
| Want a balanced everyday block | Ninja NeverDull 10-Piece Knife Set |
| Have very little counter space | Ninja Space Saving 10-Piece Knife Block Set |
| Cook for a large household and want spare steak knives | Ninja 17-Piece Knife Block Set |
| Prefer a more upscale set to give as a gift | Ninja Premium 11-Piece Knife Set |
| Want the most knives in the system line | Ninja Foodi NeverDull 12-Piece Knife System |
| Need only the essentials | Ninja StaySharp 6-Piece Knife Set |
| Want a mid-size system | Ninja Foodi NeverDull 9-Piece Knife System |
Related guides
- Bathroom Makeup Organizer With Dustproof Lid
- Stackable Bathroom Storage Bins With Lids
- Widespread Bathroom Faucets 8 Inch
Frequently Asked Questions
Is a built-in sharpener better than a removable one?
Built-in is more convenient, while removable lets you shrink the block. Pick based on counter space and how much you value always-ready sharpening.
Are these knives dishwasher safe?
The titles here do not state dishwasher safety, so follow the manufacturer’s care instructions. Hand washing is generally gentler on edges and handles.
What does German stainless steel mean?
It refers to a stainless alloy associated with German knife-making, usually tough and rust-resistant. The titles do not give a hardness rating.
How many pieces do I need?
Most cooks do well with six to nine pieces. Larger sets mainly add steak knives and extras.
