3m sandblaster, 10 pack, 4.5" x 5.5", 60 grit, sanding sheet, use on palm sanders, 1/4 sheet sanders only, use on many surfaces, including wood, metal, & fiberglass, will not discolor your sanding surface, press sheet firmly, backing is coated with extremely durable cubitron mineral, stays sharp, resulting in a more consistent sanded surface & longer paper life, cuts 3 times faster & lasts 3 times longer, resists tearing, clog resistant for less work.