Oster Lucky No. 9 Cat Blades feature a revolutionary new tooth design that allows you to cut through the feline coat faster, easier, and safer than ever before. By reducing track lines and leaving the coat with a clean, smooth finished look, the Lucky No. 9 Cat Blades are a must-have for anyone who wants to take the stress out of feline clipping. Size #30 leaves hair .5mm (1/50")