If you’ve seen adverts for the Ninja knife set and wondered whether it’s worth the money, the short answer is: it’s a solid buy if you want knives that stay sharp without a separate sharpening stone. A Ninja knife set is a block of kitchen knives, usually five to fourteen pieces, with a built-in sharpener that you swipe the blade through in seconds. The brand behind them, SharkNinja, is better known for blenders and air fryers, but the knife range has become one of its most reviewed kitchen products.
This guide covers every current UK model, what each one includes, real prices, how the sharpener actually works, and what you need to know about buying knives online in the UK, since there are rules around age and delivery that catch people out.
What Is a Ninja Knife Set?
A Ninja knife set pairs a set of kitchen knives with a wooden or plastic knife block that has a sharpener built into it. Instead of buying a separate whetstone or electric sharpener, you slot each knife into a groove in the block and pull it through a few times. Ninja calls the feature StaySharp on older models and NeverDull on newer ones, and both do the same basic job.
The blades themselves are forged German stainless steel (grade X50CrMoV15), which resists rust and holds an edge well. Every set includes at least a chef’s knife, a bread knife and a paring knife, with larger sets adding a boning knife, a santoku, kitchen scissors and steak knives.
Which Ninja Knife Set Should You Buy?
There are three main sizes sold in the UK right now, and the right one depends on how much you cook and how many people you’re feeding.
The 5-Piece Set (K32005UK)
This is the entry point, and it’s the one most first-time buyers pick. It includes an 8-inch chef’s knife, an 8-inch bread knife, an 8-inch carving knife, a 5-inch utility knife, a 3.5-inch paring knife, kitchen scissors and the knife block with sharpener. It covers the basics well: chopping, bread, roasts and fiddly prep work.
The 6-Piece Set (K32006UK / K62006EUUK)
Very close to the 5-piece set but with a slightly different knife line-up depending on the exact model code, and a stainless steel block option (K62006EUUK) if you don’t want the black plastic version. Worth checking the exact contents on the retailer’s page, since Ninja has run a few near-identical variants under different codes.
The Deluxe 14-Piece Set (K32014UK)
The biggest set adds a boning knife, a santoku, and six steak knives on top of everything in the smaller sets. This is the one to go for if you cook for a family regularly, host dinners, or just want a full block rather than topping up piece by piece later.
How the Sharpener Actually Works
This is the bit that makes a Ninja knife set different from a standard block. Rather than sharpening on a stone or steel, you lock the knife into a slot built into the block itself, then pull the blade through the sharpener a handful of times using the lever. Ninja says this restores the factory edge angle rather than just polishing the surface, which is why the knives are marketed as staying sharp for years rather than months.
One important limit: the sharpener is designed for straight-edge knives only. Don’t put a serrated bread knife through it, since it can damage both the blade and the sharpener mechanism. If a knife in the set has teeth, it stays sharp on its own and doesn’t go near the sharpening groove.
How Much Does a Ninja Knife Set Cost in the UK?
Prices move around a fair bit depending on retailer and promotions, so treat these as a guide rather than gospel and check the current price before you buy. As of mid-2026, the 5-piece K32005UK has been retailing from around £127 at UK price comparison sites, with the 6-piece and Deluxe 14-piece sets priced higher again.
SharkNinja’s own UK store regularly runs discount codes, including a 20% off promotion on selected products that’s been running into August 2026. Argos, Amazon UK and QVC UK all stock the range too, and prices between them can differ by £10 to £30 on the same model, so it’s worth a quick compare before checking out. Some retailers, including Argos, also offer instalment finance options if you’d rather spread the cost.
Buying a Ninja Knife Set Online: Age Checks and Delivery Rules
Knives are an age-restricted item under UK law, and this catches some online shoppers off guard. Under the Criminal Justice Act 1988 (as amended), retailers can only sell knives to people aged 18 and over, and this is checked twice: once at the point of sale, and again by the courier at your door.
Practically, this means:
- You’ll need to confirm your age when you order
- The courier will ask for ID and a signature from someone 18 or over on delivery
- Someone has to be home to accept it, since knives generally can’t be left in a safe place or with a neighbour
- Some retailers restrict delivery areas for knife sets, excluding Northern Ireland and the Scottish Highlands and Islands on certain listings, so check the delivery information on the specific product page before ordering
If you’re buying it as a gift, it’s worth ordering to your own address first rather than sending it straight to the recipient, in case the age check causes a delay.
Caring for Your Ninja Knife Set
A knife set is only as good as how you look after it, and Ninja’s own guidance is fairly strict on this point.
- Hand wash only, and dry the blades immediately; the dishwasher’s heat and detergent can dull the edge and cause spotting or rust over time
- Never put your fingers near the cutting edge when drying or storing
- Only sharpen straight-edge knives in the block, never the serrated bread knife
- Store knives in the block between uses rather than loose in a drawer, both for safety and to protect the edge
Ninja Knife Set vs Other UK Knife Blocks
Ninja isn’t the only brand doing a knife-and-sharpener combo. Tefal’s EverSharp Pro range works on a similar principle, and traditional brands like Henckels and Judge sell blocks without a built-in sharpener at a range of price points. The main reason people choose a Ninja knife set over a traditional block is the sharpening feature itself: you’re paying partly for the knives and partly for not needing a separate sharpening tool.
If you already own a whetstone and know how to use it, a traditional forged block from a brand like Sabatier or Wüsthof may give you a sharper edge for the same money. If you’d rather not learn to sharpen by hand, the built-in sharpener is the main draw of going with Ninja.
FAQs
Is a Ninja knife set actually good quality?
Yes, based on UK retailer reviews the blades are consistently rated well for sharpness and build, made from German stainless steel with a full tang for balance. The most common complaints are about the sharpener wearing down faster than the knives themselves on heavy daily use.
Do you have to be 18 to buy a Ninja knife set online?
Yes. Under the Criminal Justice Act 1988, UK retailers can only sell knives to people aged 18 or over, and this is checked at both the point of sale and again by the courier when the parcel is delivered.
Can you sharpen the serrated bread knife in a Ninja knife block?
No. The built-in sharpener is designed for straight-edge knives only. Putting a serrated blade through it can damage both the knife’s teeth and the sharpener mechanism, so serrated knives stay sharp on their own.
Are Ninja knives dishwasher safe?
No, Ninja recommends hand washing and drying immediately. Dishwasher heat and detergent can cause spotting, dull the edge over time, and shorten the life of the blade.
What’s the difference between the 5-piece and 14-piece Ninja knife sets?
The 5-piece set covers the everyday basics: a chef’s knife, bread knife, carving knife, utility knife and paring knife. The 14-piece Deluxe set adds a boning knife, a santoku and six steak knives, making it better suited to bigger households or regular entertaining.
How long do Ninja knives stay sharp?
SharkNinja markets the range as staying razor-sharp for up to 10 years with regular use of the built-in sharpener, though real-world results depend on how often you use it and what you’re cutting. Reviewers generally confirm the edge lasts noticeably longer than a standard unsharpened block.
Where can I buy a Ninja knife set in the UK?
The full range is available directly from SharkNinja’s UK site, plus Argos, Amazon UK, QVC UK and John Lewis. Prices vary between retailers, sometimes by £20 or more on the same model, so it’s worth checking two or three before ordering.
