Loading... Please wait...The Stratus High Back Chair has a 1 lever middle pivot synchro mechanism with 5 position lock, a double taper gas height adjustment, tension adjustment and comes standard without arms. The Stratus High Back Chair is two piece ply, with the seat being High Density Foam and Medium density foam for the back. The Stratus High Back Chair has a standard 640mm diameter black nylon, glass re-enforced base with options to be polished aluminium or chrome.