Diablo premium ULTRAflex™ sanding sponges include break through innovations that improve performance, extend sanding life and increase hand sanding productivity. Featuring a premium aluminum oxide blend, these foam sponges remove material faster and offer up to 3X longer sanding life versus standard hand 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 sanding sponges with longer life and extreme durability.