Velcro Disc, Different Material: Aluminum Oxide, Silicon Carbide, Mix Abrasive Backing: Velcro DISC Detailed Product DescriptionVelcro Disc, Different Material: Aluminum Oxide, Silicon Carbide, Mix ... /Special Features:It's including different material: aluminum oxide, silicon carbide, mix abrasive so can use different material wook surfacessupport to use power ...