... 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, ... Sizes Available:F240, 280, 320, 360, 400, 500, 600, 800, 1000, 1200.JIS240,280,320,360,400,500,600,700 ...