The 12.5mm Ultra-Sharp Black Snap Blades are sharper than standard silver blades by up to 25%. Crafted from premium Japanese alloy tool steel for durability, Dual-honed for an ultra-sharp blade providing precision results, this 0.45mm thick black snap blade known for it's ultra-sharp edge and precision cutting whether you're trimming wallpaper slicing through packaging or working on fine details the blade delivers clean and accurate cutting. Pack of 10.