Gator, 2 pack, 4" x 24", 50 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.