Polishing Strips are used for shaping and polishing of composite resin dentures.Grit sizes of abrasives are distinguished by colors.Customized grits and colors are available. Recommended using order : Purple -> Blue -> Green -> Pink Single Grit Size Purple- 50 m Blue- 30 m Green- 20 m Pink-12 m Dual Grit Size A Blue- 60 m Green- 40 m Yellow- 30 m White-12 m Dual Grit Size B Purple- 50 m Blue- 30 m Green- 20 m Pink-12 m Base Material PET Abrasive material Alumina Polishing strip single/dual grit size 4mm * 152mm Hose polishing Applications Composite Resin Features Soft and safe, without causing damage and coloring to composite resin restorations ; Thin and flexible film can closely fit the surface of teeth ; Central blank area in the polishing strip makes it easy to insert into the gap of teeth without any damage to adjacent surface ; Fast and time-saving polishing ; The recommended rotational speed is 5000~10000 rpm, and the contact pressure is 0.3~0.6N. Package Includes : Single Grit Size 20pcs (4 colors ) Dual Grit Size A21pcs (4 colors ) Dual Grit Size B21pcs (4 colors )