Diablo's premium flat edge sanding sponges include break-through innovations for superior sanding performance， extended sanding life and increased hand-sanding productivity. Featuring a premium aluminum oxide blend， these flat sanding sponges remove material faster and offer up to 3X longer sanding life versus standard hand sanding sheets. The flat edges make it easy to access inside corners and hard to reach surfaces. 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.