B,BA,HL,8K,Mirror finish and so on. 2B:The surface brightness and flatness of 2B is better than 2D. Then through a special surface treatment to improve its mechanical properties,No2B could nearly satisfy comprehensive uses. No.1:Polished with abrasive belt of grit#100-#200, have better brightness with discontinuous coarse stria, used as inner and external ornaments for building, electrical appliances and kitchen utensils etc. No.4 :olished