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, 14, or 28 BOSU® trainers with either instructional materials or steel storage carts, or both.