The seat and backrest can be covered with wide range of coloured fabric. The height of the chair may be adjusted by using the pneumatic cylinder. An anti-shock synchro mechanism provides 5 operating positions. Other adjustments include backrest tilt angle and stiffness control. If armrests are desired, fixed black plastic armrests are available. The base is made of black polyamide. The castors are suitable either for soft or for hard flooring.