Ceramic edge replacement cutter for blade sizes 30, 15, 10, 9, 8.5, 7F, 7, 5F, 5, 4F, 4, 3-3/4F, 5/8 inch ht and 3/4 inch ht. Ceramic cutter stays sharper longer, runs cooler and leaves a smooth finish. All Andis ultra edge, ceramic edge, and Oster model a5 blades will fit this clipper.