Type of Products: 4" (100mm) Wool Buffing Wheel Pads, perfect for 4" Angle Grinder Material: These pads are made of soft elastic wool material, which are safety, environmental-friendly, sturdy and wear-resistant with longer service time. Specification of Products: This Kit includes 10 pieces polishing wheel pads with the same specification. The outside diameter of them are 4" (100mm), inside diameter are 16mm and the thickness are 8mm, suitable for less than 7 or 8000 rpms angle grinder. Wide Application: Our buffing wheel pads are widely used in various surface buffing and cleaning, such as metal derusting, glass and ceramic polishing, marble, automotive and wood floor polishing, etc.