Gator, 5 Pack, 3" x 18", 80 Grit, Aluminum Oxide, Sanding Belts, Designed For Heavy Duty Sanding and Grinding Of Wood, Metal, Fiberglass and Painted Surfaces, For Use On Power Belt Sanders, Bi-Directional Flush Joint Allows The Sanding Belt To Run Smoothly In Both Directions, Resin Bonding System Resists Heat and Humidity, Extending The Life Of The Sanding Belt, Made Of Heavy Extra Weight Cloth For Maximum Strength.