Andis 64350 CeramicEdge pet clipper blade, size 40. Leaves Hair Inch 1/100 ". Leaves Hair mm .25 mm. Ceramic blade set for Andis detachable blade clippers. Surgical stainless-steel blade is more break resistant than the chrome plated, carbon-edged #40 blade. Can also be used with other brands of detachable type clippers. Andis' universal attachment combs (items #12990 and 12860) will fit this blade set. CeramicEdge blades feature a certified zirconium oxide ceramic cutter blade. CeramicEdge blades offer the following advantages Higher durability, stays sharper longer. Cutter runs 75% cooler than steel. Feature a smoother, faster cutting feel regardless of length or density. Break resistant material. For Andis detachable blade clippers. Can also be used with other brands of detachable type clippers.