Quick-Change Sanding Disc, Abrasive Type Coated, Abrasive Material Aluminum Oxide, Backing Material Polyester, Backing Weight YF, Coating Coverage Closed, Grade Coarse, Grit 50, Overall Diameter 1 in, Quick Change System TR, Series 361F, Maximum Operating Speed 30, 000 RPM, Resistance Properties Heat, Color Green, Package Quantity 50. This item has been restricted from sale in the following state (s): []