Mercer Industries 418060 Silicon Carbide 12″ x 18″ Floor Sanding Sheets, 60 Grit (20 pack). 20 – Precut sheets for any 12″ x 18″ buffer – square buff, Clarke, deva, silver line. For hardwood or concrete. Silicon Carbide grain gives a consistent performance at a competitive price. Extra Heavy weight paper backing provides extra durability, high tear resistance. Backside of sheet has enough grain on it to adhere to a sanding pad. Available in grits 20 through 100 for all your sanding needs. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. We usually respond within 24 hours on weekdays. Thank you for shopping at our store.