The Smart Orbit Rotating Ball Holder is a non-powered unit, that has an aluminum base with 100 chrome steel ball bearings and an ABS ball cup for durability and smooth operation. Light weight; carry one in your ball bag for quick cleanup of your bowling balls after bowling with your favorite ball cleaner and to make fast, consistent surface adjustments during practice with your chosen grit abrasive pad. Use the Orbit with the SMarT Star or Sun for even faster sanding. You can mount* it to your work station at home/shop through the four counter-sunk mounting holes in the base. See how the Orbit works with the SMarT Star. *Screws not included