3M(TM) Cloth Belt 761D, 3 in x 18 in P150 Y weight Filmlok, 5 per inner 25 per case A Cubitron(TM) abrasive grain cloth belt constructed on a Y weight, strong, durable cloth backing. Resin bonded for heat resistance. Grade: P150. Primary markets: metalworking, woodworking. For tough portable belt sanding jobs; features long-lasting, durable 3M(TM) Cubitron(TM) abrasive grain on a strong Y-weight backing. The closed coat feature provides a better finish and less aggressive cut than a comparable open coat abrasives of the same grade. The purple* color indicates it's leading edge technology designed to provide the lowest possible manufacturing costs. *The purple color is a trademark of 3M.