Image shown is actual grain. These are industrial grade 4" x 8" x 13-1/2" FG pump sleeves. FlexGel is a ceramic grain coated abrasive "J" weight poly cotton coated abrasive material, with grinding aids added to the resin, and a closed coat. It is a high performance metal polishing material, provides outstanding performance and consistent finishes. FlexGel is strong, but very flexible. It can last 3-5 times the life of A/O for metal polishing. Keystone Abrasives warranties all of our pump sleeves for manufacturer’s defects and your satisfaction is completely guaranteed!