East 5 Star Swivel Base on Castors / One Piece Moulded Polypropylene Shell / Gas height adjustable with synchro-mechanism / With Perforated Back / Available in Black, White or Grey Only / Integrated Arms / Generous Proportioned Seat for added Back Support / Fixed Seat Cushion with Various Choice of Fabrics / Fixed Height / Black 5 Star Swivel Base Standard / Upcharge for Polished Aluminum 5 Star Base / Ideal for any office environment.