City Block Anti Burst Yoga Fitness Ball (Pink, 75cm/29.3") 1.Material:Anti Burst PVC,air pump, and a high-quality, anti-burst Balance Ball. 2.Exercises abs, back, gluts, hips, arms, and other muscles. 3.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. Enjoy! 4.Color:Pink,Blue,Purple 5.Available Size:Small:Midium: 65cm/25.4",Large:75cm/29.3"