Diablo premium flat edge sanding sponges include break through innovations for excellent 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 excellent grain bonding system, ENDURA-BOND, provides Diablo sanding blocks with longer life and extreme durability.Ultra-fine grit for intercoat sanding of stain/varnishLonger length for medium surface areasPremium aluminum oxide blend designed for maximum life and up to 3X more material removal versus premium foam sanding blocksUnique solvent-free coating prevents clogging and pitch build-up for maximum performance and extended lifeENDURA-BOND provides excellent grit-to-backing bond for extreme durabilityFlexible foam material withstands tearing, crackling or buckling