Image shown is actual grain. These are industrial grade 6" x 48" CG sanding belts. CoolGel is a ceramic alumina blend on a heavy "Y" weight full polyester backing, with a closed coat, with a top coat grinding aid to promote cooler grinding temperatures. It is designed for sanding stainless steel and other carbon steel alloys. Keystone Abrasives warranties all of our sanding belts for manufacturer’s defects and your satisfaction is completely guaranteed!