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About this item ★ Ergonomic Design: the ergonomic backrest fits spine curve, detachable and adjustable headrest, 5D adjustable armrests, easily adustable padded lumbar support and adjustable height, all provide you with a comfortable seating experience! ★ 104°-125° Reclining Adjustment: 3 lockable back supporting angles at 104, 116 and 125 degrees, 9-degree forward tilt locked at 104 degree; with the adjustable reclining resistance, easily get the desired support angle and flexibility to suit your size and weight when working or relaxing. ★ Comfortable Sitting for Long Time Working: breathable mesh back and thickness high density foam cushion; no deform after long sitting. ★ Proved sturdy and safe: imported Korean Sanhongsa (SHS) cylinder, BIFMA certified, 120,000 times rotation tests; the polished metal base is proved steady and durable by over 100,000 times of reclining (330 lbs loaded) test; Smooth casters with noise reduction mechanism allowing silent movement.300 pounds (136KGS) is the limit, so we still recommend not to exceed 245 pounds (110KGS) for a better experience. ★ Easy assembly and worry-free customer support: comes with necessary tools and pre-assembled seat mechanism; following the assemble instructions, it is effortless to finish the assemble within 20 minutes. Duwinson offers 3-year worry-free warranty for our ergonomic office chairs. If any problem with your purchase, please contact our service team. Your 100% satisfaction is guaranteed! No Description