... , high density felt, is cut by mechanical stamping mill, made of various shape felt bob. 2. Felt bob have Elasticity, toughness ... 's inner, outer, Corner, groove, arc, cone angle of the inner wall of the mill special mold polishing, nylon, stainless steel, high ... used for polishing wood carving, stone carving, jade carving, ceramic arts, etc. grinding head of wool felt