Our revolutionary Master Grooming Tools Ceramic Clipper Blades feature a cutting blade that is made entirely from high-tech ceramic material with a super hard metal comb that is cryogenically treated for ultimate durability and long life. Ceramic does not conduct heat, so they will not get hot like steel blades. They require less coolant spray during operation and dramatically minimize the risk of clipper burns. Hold a sharper edge longer than traditional detachable blades Require less sharpening treatments Ceramic cutter has a Rockwell Hardness of 78 Steel comb has a Rockwell Hardness of 62 Master Grooming Tools Ceramic Clipper Blades are compatible with all detachable-blade clippers. Satisfaction guaranteed. Blades are available in the styles listed below."I love these blades! I can clip all four poodle feet before the blade starts to get hot. I've used the #10 on the worst jobs-those greasy cocker ears included-for weeks now, and they are still cutting just fine. I've used the #7F to clip down Cockers, Shih Tzus and more, and it's still sharp." Michelle C. Methuen, MASee the Specifications tab for product details.