Diablo's premium dual-edge sanding sponges include break-through innovations for superior sanding performance, extended sanding life and increased hand-sanding productivity. The sanding sponge's dual-edge creates concave, edge and bevel profiles with the use of one sponge. The full contact design provides maximum sanding potential by delivering consistent scratch patterns and ultra-smooth finishes. The superior grain bonding system, Endura-Bond, provides Diablo's sanding blocks with longer life and extreme durability.