Made from bonded resin with combination of grains, Sigma Green Max offers fast stock removal and produces approximately 100 RA finish while achieving physical balance, eliminating chatter and minimizing stress on operators. Wheel is suitable for use on metals such as stainless steel, mild steel, hard face, titanium, alloys, and aluminum. Sigma Green Max does not discolor or warp stainless steel, maintains cool temperature while grinding, and will not load up on aluminum.