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Title: Makes a great desk chair
Review: I use this ball as a desk chair and it meets my needs perfectly. For some context, I'm 6'1", 200 lbs, and my desktop is at 30" with 25" clearance underneath. I inflated the ball to almost exactly 75 cm without any concerns. The included pump is adequate, but you'll pump for 15 minutes or so. The plastic plugs seal up the ball just fine, and come out easily enough with the help of a pointy object. I haven't had to do this but once initially to adjust the amount of air. It has held the pressure pretty much constant for 5 weeks now. The ball does not pick up lint and dust, so it stays looking clean. I like that it's rated for so much weight--it doesn't feel at all vulnerable to bursting, even when I bounce on it, which is a nearly automatic reaction to sitting on the thing.
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