Diablo, 4 Pack, Corner Contact 180Grit Ultra Fine Sanding Sponge Diablo’s Premium Corner Contact Sanding Sponges Include BreakThrough Innovations For Superior Sanding Performance, Extended Sanding Life And Increased HandSanding Productivity Featuring A Premium Aluminum Oxide Blend, These DualEdge Sanding Sponges Remove Material Faster And Offer Up To 3X Longer Sanding Life Versus Standard Hand Sanding Sheets The Sanding Sponge’s Angled Edge Creates Precise Edge And Bevel Profiles In Tight Corners And The Longer Length Allow For Sanding Medium Surface Areas The Full Contact Design Provides Maximum Sanding Potential By Delivering Consistent Scratch Patterns And UltraSmooth Finishes The Superior Grain Bonding System, ENDURABOND, Provides Diablo’s Sanding Blocks With Longer Life And Extreme Durability