Brand: Trideer Color: Black Features: ?Improve Posture Relieve Back Pain?- Using our yoga ball chair for office can improve your sitting posture; strengthen your core muscles; reduce lower back pain to encourage a healthier life style ?Help Improve Childbirth?- The micro movements promoted by sitting on the pregnancy ball chair at home stimulates your body constantly, resulting in a heightened flexibility to help birthing ?Stability and Safety?- Our yoga ball chair is made of non-polluting and hypo-allergenic material; rated up to 330 lbs. The base keeps the stable ball from rolling around. The 65cm exercise ball is recommended for customers 5'3? to 5'10? in height ?Anti Burst Slow Deflation ?- Our ball chair is made with the honey comb structure; when being punctured by sharp objects,the ball will slowly deflate within 3-5 seconds.No abrupt explosion to reduce the chance of injury significantly ?Inflation Instructions?- Inflate the ball to about 80% of the recommended size firstly; leave on for 1-2 days, then inflate to the recommended size. Inflate the ring base in the same way as for the ball; only 30 to 40 pumps to reach perfect condition Warranty: 1 year Package Dimensions: 26.0 x 26.0 x 26.0 inches Listing and template services provided by inkFrog