1.High back mesh chair, nylon backrest. 2.Adjusted headrest, adjusted 2D armrest,adjust back cushion. 3.Aluminum connection part. 4.Mould foam (headrest, back cushion, seat). 5.Synchro mechanism. 6.BIFMA 100CM chromed gaslift(class 3). 7.330MM aluminum base with BIFMA nylon castors. 8.Export strong carton.