没有切削力的抛光轮，第一步蓝色，第二步用棕色，第三步用灰色，可抛30-50颗牙，一套6只能抛100颗。
No cutting force of the polishing wheel, the first step blue, the second step with brown, the third step with gray, can cast 30-50 teeth, a set of 6 can only throw 100.