Aluminum oxide grain on a flexible cloth backing.Open coat structure prevents loading.Water resistant.Long life combined with excellent stock removal, excellent for woodworking applications.F-weight cloth backing ????????????high flexibility., Resin over resin construction for a strong bond that is resistant to heat and moisture.Cloth backing for durability and flexibility.Box label UPC bar coded for easy identification and inventory maintenance.Broad assortment of grit sizes for a wide range of sanding and finishing applications.