Topstar Sitness 5 series exercise ball chair is a unique alternative to everyday office chairs, and is perfect for use as a computer chair, conference chair, gaming chair, and more. Chair consists of a heavy-duty inflatable exercise ball that rests on a base with five chromed feet, and is covered with a modern Black mesh fabric.Chair works like an exercise ball – the lack of a back rest forces users to maintain proper posture and balance, working their core muscles while doing desk work. Chair can be adjusted for users of varying weights by changing inflated air pressure (a hand pump is included). Weight capacity is 250 lbs.Ships ready to assemble.

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