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 10 pack assortment includes 2 - 60X, 3 - 80x, 3 - 120x, and 2 - 150X.