SITNESS RS office swivel chair, incl. head rest and arm rests, black/black. Supplied = partially assembled. Cover material = vinyl, polyester. Colour of covering = black. Back rest colour = black. Frame colour = black. Frame material = nylon. Seat mechanism = synchronous mechanism. Frame design = with castors. Height adjustment range = 420 - 550 mm. Type of arm rests = with arm rests. Back rest height = 600 mm. Seat depth = 480 mm. Seat width = 500 mm. Shape of seat shell = contoured seat. Design of castors = castors for soft floors. Max. load = 110 kg. Period of use/day = up to 8 hours. Product type = operator swivel chairs. Includes head rest and arm rests. Large contoured seat with Sitness joint. Stable plastic five star base, black. Net/upholstery combination cover. Safety double castors in modern spoke design. Height adjustable back rest with head rest. Net/upholstery combination for optimum back support and maximum comfort. Large contoured seat for maximum comfort with SITNESS jo