The Tigersharp replaceable blade system means you never have to sharpen a blade again. When your current blade grows dull, simply unscrew the bezel and slide backward to loosen. Tap the knife against a stable edge, like a desk or counter, to gently remove the old blade. Finally, slide the new blade between the guides and tighten the bezel. As simply as that, you have a fresh, sharp blade on your Camillus knife again. These blades are compatible with the Camillus Tigersharp Folding Knife in silver, blue, and black. The package includes 2 blades with a plain edge.