Hook-and-Loop Surface Conditioning Disc, Abrasive Type Non-Woven, Abrasive Material Aluminum Oxide, Backing Material Not Applicable, Backing Weight Not Applicable, Coating Coverage Not Applicable, Grade Medium, Grit Not Applicable, Overall Diameter 4 in, Series SL-DH, Resistance Properties Wear, Number of Vacuum Holes Non-Vacuum, Color Maroon