Image shown is actual grain. These are industrial grade 4" x 132" EX sanding belts. EX is a NEW standard "X" weight aluminum oxide poly cotton coated abrasive material, with a semi-closed coat. It is versatile and relatively inexpensive, providing outstanding performance for the money. EX is good for general sanding of both wood or metal. Keystone Abrasives warranties all of our sanding belts for manufacturer’s defects and your satisfaction is completely guaranteed!