Polypropylene back frame with and armrest. Single locking mechanism with pneumatic for height adjustment and tilt tension control. Polypropylene chair base in diameter ; 660mm and BIFMA passed polypropylene castor. Black color mesh upholstery for back and our standard ''C'' or ''N'' fabric upholstery for seat cushion. Product size ; W55 X H91.5 X D66cm Weekday 10a.m.-5.30p.m. and Saturday 10a.m.-1.00p.m. Free Delivery within Klang Valley except Hulu Langat, Lembah Beringin and Semenyih. For outstation clients, we will deliver to your appointed transporter within Klang Valley.