Resin over resin locks in the zirconium oxide grain for maximum life. Lasts up to twice as long as aluminum oxide belts. Extra-heavy cloth resists tearing. Flush-joined belt will run both directions to double life of belt. 2 per package. Size: 3" x 18" Grit: 80 Grit Type: Heavy-Duty Abrasive Material: Zirconium Oxide Color: Application: