Aluminium oxide with cloth backing for use with the Triton Portable Oscillating Spindle Sander TSPSP650. For use on wood, plastic, ferrous and non-ferrous metals, and most non-metallic materials. Includes sizes 13, 19, 26, and 38mm (1/2", 3/4", 1", and 1-1/2") Length 76mm (3") .