These Triton 150 Grit sanding sleeves are made of aluminum oxide with cloth backing for use with the Triton oscillating spindle sander Tsps370. For use on wood, plastic, ferrous and non-ferrous metals, and most non-metallic materials. Includes sizes 13, 19, 26, 38 and 51mm (1/2", 3/4", 1", 1-1/2" And 2"). length 115mm (4-1/2").