The SMarT Star was designed for sanding and polishing all types of bowling ball coverstocks including; reactive resin, urethane and plastic, using a 3/8" variable speed hand drill* and the SMarT Orbit Rotating Ball Holder. The SMarT Sun was designed to be used with a ball spinner or at the lanes to make quick surface adjustments. Hook and loop fasteners allow for quick changes of 6” Abralon and SiaAir abrasive pads. A Terry Cloth Bonnet slips over the SMarT Star or Sun for polishing. With the SmarT Star or the SMarT Sun you can revive “dead” bowling balls, resurface and refresh your current arsenal and change the balls reaction to match up to lane conditions. Maintenance is the key to success! See Why Bowling Ball Maintenance!, (copy & paste ) this link: https://youtu.be/hpIoozNqLuI. The SMarT Combo includes these accessories: SMarT Star Sanding and Polishing Tool SMarT Orbit Rotating Ball Holder SMarT Sun Tool, (4) TruCut Abrasive Pads; Grits; 500, 1000, 2000, 5000 (2) Custom Terry Cloth Polishing Bonnets Plastic Cup, Instructions ** Drill not included