Self centering design protects vehicle from the backing plate edges, eliminating scuffs, burns, and marks from the backing plate edge. The reticulated open cell foam provides extreme durability and tear strength. Controlled porosity of foam insures uniform cutting & polishing action. Lamination of the velcro surface insure long life and use. Velcro edges will not lift or tear from pad. Foam pads are completely washable. Foam Compounding Pad.