5"x8 Hole 280 grit Hook & Loop C-Weight Non-Loading Stearated Heat Treated Aluminum Oxide Sanding Discs. An excellent all-purpose disc with a fast cut on a durable yet flexible C-weight latex impregnated backing paper. Can be used for raw wood, paints, primers & finishes, composites, fiberglass and metal. Sun gold Abrasives have been manufacturing coated abrasive products for over 37 years. Can be used for sanding of wood, metal, composites, finishes, paint.