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Thank you! That's my boyfriend's chair! It's this steelcase: https://www.amazon.com/gp/product/B078H8RCX1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
He got it a few years ago after kitty killed his Ikea markus lol. The Steelcase is great cuz very adjustable, though we did use a tiny bit of knife oil on the center column mechanism cuz it was a tiny bit squeaky at first, has been perfect since.
OMG, I've tried countless chairs because I spend anywhere between 4 to 16 hours on busy days sitting and I have arthritis on my spine, plus I'm short so I needed a super specific kind of chair. This one is by far the best.