office Chair779AL-1

new nylon back, , self-adjust lumbar support back and up and down ,headrest can up and down and adjust by angel 3D arm +PU pad (up and down , left and right, front and forward) wire-control mechanism, up and down , tilting and locking , move front and forward with footstep class 4 gaslift 350mm aluminium base ,Bifma standard 60mm pu caster