Our 6 Foot Accessory Tray Wall Ball Kit packages weights for all user levels. The package consists of one each of 6 lbs, 10 lbs, 14 lbs, 18 lbs, and 20 lbs wall balls and fits our 6 Foot X-Rack Accessory Tray (not included in package) used on our storage racks and X-Racks. The non-bounce balls are a necessity for use with the ball targets on X-Series Functional Training X-Racks, X-Cages, and X-Labs. Comprised of heavy-duty vinyl-coated nylon, the wall balls remain dimensionally stable and balanced over time. Use with one of our Functional Accessory Storage Equipment options.