TECHNICAL PARAMETERS: Materials: Genuine leather* Eco-leather* Armrests: Metal chrome with soft pads, upholstered in leather or eco-leather Swing mechanism: Reinforced with the possibility of fixing the chair in the working position. Seat height adjustment Crosspiece: chrome-plated Metal, reinforced Gas. cartridge: class 4 according to the standard Germany DIN 4550 Rollers: Standard BIFMA 5.1 (USA), stem diameter 11 mm, coating â?? nylon Frame: Monolithic Gasket: Foamed polyurethane with a density of 22-25 lb/cu. m, of OpenForm, padding polyester, synthetic fluff Maximum recommended load: up to 180 kg Manufacturer warranty: 2 years