Product configuration: plastic frame: black; fabric: high quality imported net cloth; PU armrest; chassis: independent research and development of aluminum alloy linear control polishing; barometer: Korean KGS brand, three grade 100mm stroke; chair foot: HM9901 aluminum alloy polishing; pulley: 65mmPU. (large seat cushion or mobile comfort pad selection) product function: independent research and development of linear control chassis, can choose memory lock or angle lock; back cushion back angle adjustment, humanized back tightness adjustment, four section height adjustment; waist to fit automatic elastic support; seat height, seat deep section; 4D non press Button armrest adjustment (height, front, back, left and right angle)