115mm x 60 Grit Sanding Discs. ( 4 1/2" x 60 Grit). Pack 25. Aluminium Oxide. All made to highest European standards these discs will sand for long periods. The Aluminium Oxide type is recognisable by the red/brown colour, comes on a strong backing and is used in a wide variety of applications including metalwork and wood. Must be used with a backing pad.