3M Fibre Disc Back-up Pads Made to drive and support fiber backed discs during sanding, grinding or finishing processes. Fibre disc back-up pads are made of a tough plastic material, which gives support evenly across the surface of the disc. Hard density back-up pads are strong yet still slightly flexible, which allows for smooth application of abrasive discs to metal surfaces. Options available for TN Quick Change Fibre Disc Back-Up Pads (56573) and Fibre Disc Back-Up Pads (05637). Pack of 1