10 Inches to 15 Inches Office Chair Gas Lift Cylinder Replacement, 4.5'' Stroke, Hydraulic Pneumatic Shock Piston, Heavy Duty, Universal Diameter Fit for Most Office Chair, Class 4 (Polished Steel)

Hayelf Ergonomic Office Chair, High Back Mesh Computer Chair with Comfortable Adaptive Lumbar Support, Built-in Coat Hanger, SGS Class 4 Gas Lift, Heavy Duty 300lbs for Long Hours Home Office, Black