Surface-Conditioning Disc, Abrasive Type Non-Woven, Abrasive Material Aluminum Oxide, Backing Material Nylon, Backing Weight Not Applicable, Coating Coverage Not Applicable, Grade Medium, Grit Not Applicable, Overall Diameter 2 in, Quick Change System TR, Series Vortex Rapid Blend, Maximum Operating Speed 22,100 RPM, Resistance Properties Smear, Color Blue