The Togu Premium ABS Powerball helps strengthen muscles as well as improves coordination and balance. This exercise ball especially helps the abdominal, back and trunk muscles through safe, effective and dynamic back and stability training. The Togu "double groove" design provides traction and helps prevent the ball from rolling away. In the event of damage by sharp objects, this air-filled and burst-proof ball with ABS (Anti-Burst System) material provides an added level of puncture-resistant safety. Allowing the air to escape slowly through one hole instead of bursting. The ABS weight limit is substantially less than the ball's weight capacity. The Crylon material is odorless and has a total weight capacity of 2200 lbs., while the ABS capacity is 265 lbs. The Togu ABS Powerball is available in four sizes to meet each user's requirements. This one comes in blue and is about 18" in circumference once filled with air. It is latex-free and consists of 100% recyclable plastic.