... high purity green silicon carbide making abrasive grinding wheels making precise sharpening stone Description:GC-GPA is a green, friable, medium bulk density silicon carbide abrasive grain ... scaleMagnetic Material 0.0032%Macrogrit Grain Sizes Available (F or JIS):12, 14, 16, 20, 22, 24, 30, 36, 40, ... 280,320,360,400,500,600,700,800,1000,1200,1500,2000,2500,3000,4000,6000,8000.Grain Size Distribution : ...