Flex back: Integrally coloured, high performance elastomer and glass reinforced polyester structure. Height adjustable and high performance arms: Burnished cast aluminium and integrally coloured, glass reinforced nylon supports with integrally coloured, self skinning polyurethane arm pads. Flex Seat: high-resilency moulded urethane foam with textile cover and integrally coloured, glass reinforced, impact modified nylon structure. Base: Integrally coloured glass reinforced nylon or aluminium; five star design.Castors and Glides: available in hard and soft nylon, with brake. Also available with glides. Height Adjustable lumbar: integrally coloured, glass reinforced polycarbonate.