ORGANIZED AND TIDY: While seating the legs fold and don' offer any resistance, allowing you to strengthen your core. But when you stand up and leave your desk, the Chair Ball's feet will keep it from rolling away, helping maintain a clean and tidy office or work area ALTERNATIVE CLASSROOM SEATING: Stability ball chair is designed for teachers in need of Flexible Classroom wanting to teach children by example PERFECT FOR ADULTS: Inflation will determine the final size, enabling the user to find their perfect fit. Finished work early? Turn the ball over, grab two handles, and it doubles as a Hopper Ball for adults! size: 52.5 x 57CM Material: pvc colour: light orange Package Contents: 1 x yoga ball chair 1 x inflatable equipment Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.