Plastic frame: gray; fabric: high quality imported net cloth; armrest: TPU+ nylon; 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 (mobile comfort pad or big seat cushion selection) products Function: head pillow height, angle and automatic elastic support adjustment; independent research and development of linear control chassis, can choose memory lock or angle lock; back pad back angle adjustment, humanized back tightness adjustment, four section height adjustment; waist close to automatic elastic support; seat height, seat depth adjustment; 4D no button handrails adjustment (high) Low, front, left and right, angle)