Excellent polishing performance of 3 times higher durability by increasing the content of ceramic compared to existing products.Finish surface precision is improved.Since ceramic powder and alumina oxide raw material are sinter to synthetic rubber, abrasive grains are less likely to fall off and durability is excellent.There is no fluctuation of the grindstones as performing the outer shape finish.Optimum for fine scratches and burring.Optimum for mirror surface finishing.Grain Size (#):220Outer Diameter x W x Shaft Diameter x Shaft Length (mm):15 x 20 x 6 x 35Max Working Rotation Speed (rpm):15000