Easy to read sizes!! Sizes Lazor etched on the side or back of the comb permanently so you'll never have to guess the size and it will never rub off. 8 different sizes with a universal fit to all clipper brands. They are made of tough, impact resistant plastic. All combs are assembled with a self-adjusting dual spring loaded stainless steel posi-grip clamp. No tools required. Can be cold-sterylized. All combs are available individually. Guaranteed to fit on standard snap-on style blades. DO NOT USE ANY CLIPPER COOLANT ON COMBS. Okay to use Laube Blade Dip and Dr. Slick. MADE IN USA.