Andis Blade Size: 40SS Leaves Hair Inch: 1/100 " Leaves Hair mm: 0.25 mm Blade Description: Surgical-stainless steel blade set for Andis detachable blade clippers. Used as a close cutting surgical blade for vets and for grooming poodles face, feet and tail for show. 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.