Sanding Sheets, Abrasive Type Coated, Abrasive Material Aluminum Oxide, Backing Material Nylon, Backing Weight Not Applicable, Coating Coverage Open, Grade Coarse, Fine, Medium, Grit 120, 180, 80, Overall Diameter 3 5/8 in, Series Not Applicable, Resistance Properties Clog, Fray, Tear, Number of Vacuum Holes Mesh, Color Gray