Ergonomic swivel chair, synchronous mechanism, ergonomic seat, back rest height 550 mm, black cover. Supplied = partially assembled. Cover material = polypropylene. Colour of covering = black. Frame colour = graphite black RAL 9011. Frame material = nylon. Seat mechanism = synchronous mechanism. Frame design = with castors. Height adjustment range = 450 - 550 mm. Type of arm rests = without arm rests. Back rest height = 550 mm. Fittings = lumbar support. Seat depth = 480 mm. Seat width = 480 mm. Shape of seat shell = lumbar support seat. Conforms to = DIN EN 1335 part 1 - 3, DIN EN 12527+DIN EN 12529. Design of castors = castors for soft floors. Max. load = 110 kg. Period of use/day = up to 8 hours. Product type = ergonomic swivel chairs. Back rest with lumbar support. State-of-the-art ergonomic seat. Synchronous mechanism. Hardwearing fabric cover. Frame in graphite black RAL 9011. Castors for soft floors as standard. Supplied flat pack - easy self-assembly. Your advantage Classic syn