V4 office swivel chair, mesh covered back rest, black/charcoal. Supplied = partially assembled. Cover material = polyester, Trevira CS, flame retardant. Colour of covering = charcoal. Back rest colour = black. Frame colour = polished aluminium. Frame material = aluminium. Seat mechanism = synchronous mechanism, adjustable seat inclination. Frame design = with castors. Height adjustment range = 450 - 540 mm. Type of arm rests = without arm rests. Back rest height = 580 mm. Seat depth = 480 - 550 mm. Seat width = 480 mm. Shape of seat shell = flat contoured seat. Conforms to = DIN EN 1335 part 1 - 3, DIN EN 12527+DIN EN 12529. Model = mesh back rest. Design of castors = hard castors for soft floors. Max. load = 110 kg. Period of use/day = up to 8 hours. Product type = operator swivel chairs. State-of-the-art, trendy office chair with open backrest shell and covered with an actively breathing looped fabric, adapts to the spine and provides support in all positions, with adjustable height