Build core, lower-body, and upper-body muscle strength using a range of exercises while increasing balance and coordination. Allows user to focus on abs, back, hips, and more with low-impact activities. European construction ensures quality material and design. Supports up to 220 lb. Includes instructions, 2 air plugs, a plug puller, and a measuring tape to help ensure proper inflation size. Multi-Size 6-Ball Pack includes two 55 cm, three 65 cm, and one 75 cm; Multi-Size 12-Ball Pack doubles the quantities.