Work /SY operator chair on five star nylon base with polypropylene castors. Ergonomically designed. The chair has a medium height back. The back is dressed with black mesh. The seat is upholstered with den- mark fabric which is high abrasion - 80,000 martindale washable at 60 c - suitable for electro welding height adjustment by means of 13 cm gas lift. Synchronised-tilting mechanism with four locking posi- tions. Adjust the position of the seat set forward & backward safety anti-shock system / adjustable arms.