iTECHOR Exercise Ball 26IN Yoga Ball GYM Balance Stability Fitness Ball with Air Pump - Purple Material:Durable Anti-Burst 26 inch/65cm (before inflating) Yoga GYM Fitness Exercise Ball. Made of PVC, Safe to use. 1/5IN thick design, support 330 lbs, of static weight (stress test results). Inflation instruction: Take out the inserted white plug (air stopper) from the ball, insert the tip of the pump and inflate the ball to good size, and then replace the white plug back into the hole quickly. Using air pump to inflation within 2mins. Health exercise : Exercise for improving coordination and muscle strength and endurance in all of the major muscle groups, core muscles and increasing flexibility. Help in alleviating back pain and preventing pain in the future. WHAT YOU GET: A purple yoga ball, a 65cm Yoga Exercise Ball, a Air Pump, a Airlocks, and a Gas Stubbs.