Total Height Range: 130-138 cm / 51.2"-54.3", Armrest Width Adjustability: 1.5 cm / 0.6", Recline: 90-180 degree, Inner Material: Cold molded foam, Frame Material: Steel, Base (leg): Aluminum, Caster: 75 mm / 3.0", Gas Lift: Class 4, Warranty: 02 Years, CMI-GCX2C-GW.