I will not dismiss what others have said about this chair. These are all important points to consider when purchasing a chair. Luckily I am a handy person and when the seats wear out i put purple gel in the cushions what i like so far is that the seat actually feels comfortable to me be shocked at how many chairs i have bought in the last 6 months that claim to be ergonomic or comfortable, only to find they were far from it, not to mention the number of $300-$600 defective chairs I totally gave up for a chair with a headrest. They just don't make them for people over 6ft so they can sit back and work comfortably, this however is about as close to perfection as you can get, I'll say that the gas bottle appears to be the standard size that comes with most chairs. I have another lying around that fits perfectly. They don't cost much if your cylinder fails after a few months. Just buy from someone else if you like the chair. After about 6 months I will check again how the chair works.
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