lastic frame: black; fabric: high quality imported net cloth; roasted black lacquer inner tube, PU armrest; chassis: independent research and development of aluminum alloy wire control polishing; waist Leaning: TPR+ nylon; barometer: electroplating, Korean KGS brand, three class 100mm stroke; chair foot: JW aluminum alloy polishing; pulley: 60mmPU intermediate electroplating. (mobile comfort pad optional)