3M Cloth belt 777F features a blend of 3M ceramic abrasive grain and aluminum oxide for increased durability and cutting efficiency and is suitable for moderate stock removal to finishing operations. The heavyweight cloth backing supports high-pressure applications, works well on heat-sensitive metals and can be used in wet or dry applications. - 3M Ceramic aluminum oxide grain blend surpasses aluminum oxide abrasives in cut rate. Durable ceramic/aluminum oxide blend extends belt life, producing more parts per belt and requiring fewer belt changes.