Roloc Grinding DiscQuick change button. Resin bonded for heat resistance. Can be ran wet or dry. Roloc™ disc constructed on a YF weight, water resistant polyester cloth backing. Disc grade can be determined easily by the color of the plastic holding buttons (50, green; 36, brown; 24, black). Abrasive Material: Aluminum Oxide; Applicable Materials: Metal, Wood, Paint, Rusty Metal; Body Material: Polyester; Bond: Resin; Diameter: 2 in; Grit: 50; Mounting: Roll On; Quantity: 25 per box; Weight: 0.05 lb.