Package includes: 14pcs mixed grit wet polishing pads (50#, 100#, 200#, 400#, 800#, 1500#, 3000#, 6000#), 1pc velcro backing pad (5/8" hole x 11 thread). Material: diamond powder and resin powder. Made of high quality resin impregnated diamond powder. Specific points: Sharp, wear-resistant and highly efficient. Optimum RPM 2200, maximum RPM 12000. Diameter 4", height 3mm, soft back and buckle Applications: Ideal for all materials with solid surfaces. Perfect for granite, concrete, marble, stone, tile, etc. Can be used dry, but best results are achieved with water.