Smirdex Net Velcro Discs Ceramic sanding disc 750 series. Diameter 6 inch 150mm. Suitable for sanding harder surfaces such as hard wood and other solid surfaces. Closed coat structure and net fabric backing permit maximum absorption of sanded particles. Ceramic grain offers excellent lifespan of disc. As microscopic shards of ceramic break off they are replaced by the same sharp edge. Use with 150mm Velcro backing pad.