【EXERCISE MUSCLES】This premium core strengthening wheel helps build and tone your abs, arms & back. Effectively work out your core at home, the gym, or the office! 【ADJUSTABLE STRENGTH】Different button can adjust the strength of the size to adapt to different heights and exercise needs, the more the number of buckles will cause the greater power needed, eliminating the size of the restrictions. 【HIGH-QUALITY PP MATERIAL】This material has the toughness and strong impact resistance, non-toxic and tasteless, and has a great bearing degree, so it is not easy to be deformed.