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. seat cushion is exclusive first full net environmental cushion. (fixed comfort pad or mobile) Comfort pad selection) product function: head pillow height, angle and automatic elastic support adjustment; independent research and development of linear control chassis, can choose memory lock or angle locking; back pad back angle adjustment, humanized back tightness adjustment, four section height adjustment; waist close to automatic elastic support; seat height, seat depth adjustment; 4 D button (height adjustable armrest, front and back left and right angle)