Diablo's premium ULTRAflex sanding sponges include break-through innovations that improve performance, extend sanding life and increase hand-sanding productivity. Featuring a premium ceramic grain blend, these foam sponges remove up to 3X more material versus standard Aluminum Oxide sanding sheets. ULTRAflex foam technology allows flexible, multi-profile contour sanding in hard to reach areas. 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 sponges with longer life and extreme durability.