Diablo, 50 Pack, 5'', 320 Grit, Hook & Loop, Sanding Disc, Premium 12 Hole Random Orbital Sanding Discs With Hook & Lock Backing Include Break Through Innovations That Improve Performance, Extend Sanding Life & Increase Productivity, Featuring Premium Ceramic Blend, Remove Material Faster Than Other Sanding Discs & Offer An Extra Long Sanding Life, Clog Shield, Blend Of Grinding Agents, Reduces Loading & Maximizing Productivity, Superior Grain Bonding System, Endura Bond, Longer Life & Extreme Durability.