Clog-resistant and flexible for fine sanding between paint or varnish coats. Tough foam backing will conform to contoured surfaces and resist tearing. Electrostatically coated, self-sharpening aluminum oxide mineral for increased durability, life. 320-grit for final finishing, 180 for between coats. Color-coded gold (packaging/product) and imprinted with grit for easy selection. Wash to reuse.