R級： R級系列之鑽石微粉，其顆粒形狀較不規則，易碎， 較銳利之切削性。

M級： M級系列之鑽石微粉 ，其顆粒形狀較規則，切刃較 強韌。較適用於各種超硬合金、陶瓷等之拋光作業。

R series:Which partides are irregular, and more friable basic crystal structures.Which is used where a more free-cutting action is required.

M series: Which partides are more regular than series and more durable basic crystal structture.Which is used where a more heavy duty finishing action is required.