Image shown is actual grain. These are industrial grade 3" x 21" BD sanding belts. Black Diamond is silicon carbide, full polyester cloth. Grits 24-80 are on a heavy "Y" weight backing and grits 100-1000 are on a heavy "X" weight backing. It is designed for sanding glass, but also works effectively on wood, metal, plastic, fiberglass, and rubber. Keystone Abrasives warranties all of our sanding belts for manufacturer’s defects and your satisfaction is completely guaranteed!