Gator, 5 pack, 3" x 21", 120 grit, aluminum oxide, sanding belts, designed for heavy duty sanding & grinding of wood, metal, fiberglass & painted surfaces, for use on power belt sanders, bi-directional flush joint allows the sanding belt to run smoothly in both directions, resin bonding system resists heat & humidity, extending the life of the sanding belt, made of heavy extra weight cloth for maximum strength.