... , red, green Size: 4"-20" Width: 1"-3" Density: 3P-12P Grit: 120#-320# Abrasive: Aluminium oxide, green/black silicon carbide ... , white aluminium oxide 1. Brown Abrasive: Aluminium oxide Cutting power for aluminum castings, ... , effective, no residue, no black. Of zinc alloy, chrome-plated hard texture of the workpiece, such as the very ...