PROMIC Exercise Ball (45-85cm) with Quick Foot Pump, Professional Grade Anti Burst & Slip Resistant Balance Ball for Yoga, Balance, Workout, Fitness, Use for a Work Chair (8 Colors) Quality Materials for a True Anti Burst Ball- Thick walls made from professional grade rubber that is free of BPA & heavy metals Supports 1100+ LBS so you never have to worry about using weights Slip-resistant & Easy Cleaning Surface - matte textured finish with horizontal lines to improve grip and avoid slipping Quick Foot Pump Included - a easy-to-use foot pump comes included for quickly and easily inflating the balance ball Versatile Use - One of the most versatile pieces of home gym equipment you can own. These exercise balls are great for yoga, pilates, or even work great to replace your office desk chair Made of professional grade rubber that is durable and free of BPA &amp; heavy metals Matte textured finish with horizontal lines to improve grip and avoid slipping Foot Pump &amp; Back-up Plugs &amp; Plug remover Included Versatile Use - One of the most versatile pieces of home gym equipment you can own. These exercise balls are great for yoga, pilates, or even work great to replace your office desk chair Durable. Made of high-quality rubber, the balance ball provides long-lasting dependability. Supports 1000+ LBS so you never have to worry about using weights Anti-Burst tested to sustain a 2CM cut Easy Cleaning Surface with Anti-Slip Ridges As Described Published Size Awesome fitness equipment for developing balance and stability while making it easier to target specific trouble spots Work great to replace your office desk chair.Studies show that using an exercise ball as your chair can increase health Birthing ball for pregnant women Children have fun / Parent-child interaction Elderly rehabilitation training 5 yrs old - 4&#039; 8&#034; : 45cm 4&#039;8&#034; - 5&#039;3&#034; : 55cm 5&#039;4&#034; - 5&#039;10&#034; : 65cm 5&#039;11&#034; - 6&#039;4&#034; : 75cm &gt;6&#039;4&#034; : 85cm Following the steps and inflate the ball to about 80% of diameter initially. Wait a further 24 hours before inflating to the recommended size. You should avoid using the ball within the first 24 hours. Do follow the above steps to inflate the ball, and wait a further 24 hours before inflating to the recommended size.