4 kinds: Buffing Polishing Disc: > Wool Felt Buffing Disc (white) > Nylon Fiber Buffing Disc (gray) > Abrasive Flap Disc Grit 80 (magaspang) > Abrasive Flap Disc Grit 320 (magaspang) 100% Brand new and High Quality. Application: Glass, Stainless Steel, Brass, Copper, Marble, Wood Ceramic & other Metals Diameter: 100mm (4inches)