SPECIFICATION : - Foam Type : moulded foam - Foam Density : 50 g/cm³ - Frame Construction : metal frame - Chair Cover Material : Scratch & Hydrolysis Resistant Thicker PU - Armrest : 3D armrest - Mechanism Type : Buttterfly mechanism - Rocking Range : 90~180 degree - Gas Lift Specification : 80nm Carbon Surface - Gas Lift Class Glass : Class 4 - Adjustable Headrest : yes - Base Type : Nylon base - Caster Size & Material : 60mm Racing Style BIFMA - Assembly Required : yes