Our office balance ball chair will transform the way you sit! By promoting small body movements and constant stimulation, the brain will experience a heightened sense of focus. It will also improve your back pain, circulation and other issues.Specification:- Material: ABS, PE Chair ＋ PVC Ball- W x H: 53 cm (20 7/8") × 79 cm (31 1/8")- Load Bearing: 300 kg (660 lbs)- Installation required: Yes- Rotatable: YesFeatures:- Ergonomic chair.- Fits most standard size desks.- The balance ball can be taken out and used alone.- Strengthens core muscles and improves blood circulation.- Can be used for special populations such as autistic people, pregnant women, etc.- Maintains correct posture, reduces muscle fatigue and relieves back and neck pain.- Helps strengthen and exercise the entire body, especially the back, abdomen, neck and thighs.Package Contents: 1 × Balance Ball1 × Ball Chair1 × Air PumpWarm Reminder:- It may be necessary to re-inflate the ball after the initial inflation to allow the ball material to stretch to its final size. Inflate the ball, let it sit for 24 hours, deflate it by 50% and then fill it again to a height of 55 cm.- Manual measurement, there will be 1-2 cm error, depending on the actual size.- Due to differences in some monitors and lighting reasons, there may be a slight color difference between pictures and objects.Good Service:- If you have any questions about the product, you can contact us at any time, we provide 24-hour customer service.