... 0.3-0.5, Φ0.6-0.8, Φ1.0-1.2 Φ1.4-1.6, Φ1.8-2.0, Φ2.2-2.4 Φ3.0, Φ4.5, Φ5.0, Φ6.5, Φ7.0 Φ8 ... .5, Φ10, Φ12, Φ15, Φ20, Φ25, Φ30, Φ40, Φ50, Φ60 RollingΦ8.0 ... , Φ10 Φ8.0 ... , no water absorption Qualified product≥ 6.0≤ 8 No cracking, obvious edges, minor variegations allowed ...