SITNESS stool, seat 420 mm, blue. Supplied = flat pack. Seat height = 420 - 550 mm. Seat diameter = 420 mm. Seat material = polypropylene. Seat colour = blue. Type of height adjustment = gas spring with release ring. Frame design = base on rubber tyres. Frame material = cast aluminium. Foot plate diameter = 390 mm. Seat design = round seat. Max. load = 110 kg. Period of use/day = up to 4 hours. Product type = office stools. Seats with swing. Adjustable movement range. Patented rubber tyres. The strain on your spinal column is relieved, your back muscles are strengthened and blood circulation helped. Ergonomically shaped seat, 420 mm, cover 100% polypropylene. The stable base is mounted on a patented rubber ring. Lateral movement range can be set with compressed air mechanism. Frame made of cast aluminium, polished metal base plate. Supplied flat pack - easy self-assembly.