Stylish and ergonomically designed ball chair has a generous diameter of 55cm with a robust inner ball, free from harmful plasticisers, it has a anti-roll safety feature to prevent the ball moving when you stand up and for secure storage Can be used at home or as an office ball chair to promote active working, alternating every 30 minutes between the ball and a chair, encourages the use of back and core muscles to help improve posture A strong, durable and robust ball chair with carry handle, It is suitable for heights between 135 and 155cm and can hold up to 150kg. Additionally, the light grey ball cover can be removed and is hand washable to ensure it remains clean and hygienic Quick and easy to set up by inflating the inner ball with the hand pump supplied and inserting the plug (inflate ball 80%, wait 2 hours, then inflate to 100% so cover is almost wrinkle-free) Contents: 1 x Leitz Ergo Active 55cm Sitting Ball, 1 x Hand Air Pump, 1 x Fabric Ball Cover, 2 x Plugs, Dimensions: (W x H x D): 550 x 550 x 550 mm, 2.41kg, Light Grey, Ergo Range