These are replacement blades for the DGX Sharp Cut - Quantity 2 very sharp Zr02 CERAMIC blade that provides an incredibly effective cut. Ceramic is the second hardest material (right after Diamonds) and after sharpening will maintain that cutting edge and does not wear down. You never need to sharpen the blade! It is also very easy to clean as ceramic is not porous and will not collect dirt or grime, making a quick rinse after diving all you need to maintain the tool for years of use. The Sharp Cut is lightweight and the ceramic blade will never rust. The blade is ideal for slicing and can easily cut line up to { 0.3 in | 8 mm } in width and { 2 in | 5.1 cm } nylon webbing with little effort. The kit contains two ceramic blades that are in a protective plastic case for storage.