Image shown is actual grain. These are industrial grade 4" x 8" x 13-1/2" EJ pump sleeves. EJ is a standard flexible "J" weight aluminum oxide poly cotton coated abrasive material, with a semi-closed coat, with a white no fill backing. EJ is good for sanding wood, carbon steel and non ferrous metals. Keystone Abrasives warranties all of our pump sleeves for manufacturer’s defects and your satisfaction is completely guaranteed!