Grits: 50, 100, 150, 500, 800, 1500, 3000 and . Sharp, wear-resistant and high efficiency. Optimal RPM 2200, Max RPM 12000. Works good for Wet or Dry polishing of stones. Perfect for Granite, Concrete, Marble, Stone, Tiles etc. Color: Gray The back color is random Material: diamond Powder Wet/Dry, Diameter 4 inch , Height 3 MM, Backed Flexible. Aggressive and Durable made with quality Diamond Powder impregnated in Resin. Size: 100 mm/4 inch Quantity: 8pcs Please Note: Please add water when you operate. Package Contents: 1 x Polishing Pads Kits (Grit 50, 100, 150, 500, 800, 1500, 3000, one per each) Note: Random color, don't accept the specified color. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.