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