Profile: Revolution, Inc. supplies replacement parts for floor sanders. We crown all our belt style drums to improve sandpaper tracking performance. We use original specs to design our products. We manufacture our edger pads to have a thicker shell to reduce bending and deformation. We use quality grade sponge & black rubber available, and we use the same light tan rubber on the ProSand drum as they use in Germany. We dynamically balance every drum on two planes to .01 oz-inch.