OKNIFEMatte Ceramic Utility Knife Blades, 10-Pack - Compatible with Otacle U1,U1 Pro & U1 Ti, Fits Most Utility Knives – Durable, Harder Than Steel (Matte Ceramic Blade)

Very cool looking and super sharp! Enough said.

We have a cool NK folding box cutter. It was a gift from a connoisseur of fine knifes LOL. Once breaking the tip off the blade that came with it, we headed to Home Depot to get refills. Not so fast, turbo. The blades on the shelf do not have the little holes needed to line up properly. So we returned the ordinary blades and headed to Amazon for the more esoteric varieties. The hole pattern of these blades looked right, and they were. BTW, you’ll need a tiny torx pattern wrench, to open your knife. Hold it over a cloth, so the world’s tiniest screw won’t bounce away and disappear forever. So, awesome, we can use the knife all we want without treating it with kid gloves.

Good quality and work perfectly. Will buy again

So 4 stars... Why?1. Need to use these more to determine how well they stand up. After all, they are ceramic and thin, but the utility knife role often results in forces that are not perpendicular to the blade edge, which may cause the ceramic to snap. We'll see.2. The good news is these are sharp and ceramic, so expect long edge retention and longer blade life.3. These are two slot blades - the good is that this means the blade cannot be "fully" extended, making it less likely to snap; the bad is that this means the blade cannot be "fully extended" to make best use as a cutting tool.

Love my little oknife and it's silly they take a special blade. But this is that special blade that keeps the knife in use.

I've used several brands and these work just as well as any other. Nice little plastic container to store them. Did standard utility knife, cleans granite and quartz without discoloring seams.

Just as advertised. Fit perfectly into my knife and are great quality.

They must be the sharpest blade in the market, but they brakes very easily.I will not buy them again!