Air One office chair mesh back & fabric seat chair on five star naylon base with polypropylene castors. Backrest grey mesh back & black seat is upholstered with fabric which is dust-proof / oil - proof / water proof height adjustment by means of 13 cm gas lift. Height adjustable lumbar support (vertically mov- able rod element). Synchronised-tilting mechanism with four locking positions. Safety anti-shock system. 3d - adjustable arms.