The Gymnic Arte Plus Burst-Resistant Exercise Ball is a multi-functional piece of equipment that can be used for both fitness activities as well as physical therapy practices. Use the Gymnic Plus Burst-Resistant Exercise Ball at home, the office, or at the gym to perform a wide range of exercises to help improve balance, coordination, flexibility and stabilization. This piece of equipment easily integrates into your daily routine; simply adjust the inflation intensity in order to customize the stability level you need. Push your workout to new heights by engaging more muscles groups at a time. By incorporating balance-centric exercises into your workout, it enables your muscles to work harder to stabilize your body. This helps intensify your workout which in turn, burns more calories. Made from durable, latex-free, vinyl which supports a maximum weight of 270 lbs. and is also phthalate and BPA free. The burst-resistant quality of this exercise ball is possible because of the medical grade resilient material it is made out of. Besides providing high performance and increased safety during use, if the exercise ball is punctured it will deflate slowly, protecting the user from harm. The 55 cm exercise ball is recommended for users 5' 1" to 5' 7". The 65 cm exercise ball is recommended for users 5' 8" to 6' 2". The 75 cm exercise ball is recommended for users 6' 3" and taller. Due to the unique nature of this product no two exercise balls will be the same color; suitable for ages 5 and up.