This is a high quality sanding belt designed specifically to provide outstanding life & durability for many wood belt sanding applications. It is made with a special open coat A/O grain & a strong "X" weight poly cotton cloth backing. Belts are antistatic, washable plus it has an additive in the resin to resist loading. The 5 pack assortment includes 1 each of the following; 60x, 100x, 120x, 150x, and 220x.