Use with the 63.5 cm (25" dia) platform up or down for different exercises and user skill levels. No other balance trainer offers the durability or quality. Original BOSU® model has a thick 6.5 lb inflatable PVC dome bladder; BOSU® Pro has an 8 lb bladder, and extra durable dual-overmolded platform with full nonskid floor contact (no feet). Supports users up to 300 lb, and includes an inflation pump. Each trainer is 25" dia x 12"H, weighs 15 lb. Available in packs of 10, 12, or 24 that include the BOSU® Complete Workout System. ClassPlus™ Packs add our new UltraFit™ Steel BOSU® Storage Cart that provides easy access and the best organization.