1) With 7series Aviation-aluminum frame, full metal baking finished;
2) Double cross brace,can be folded;
3) The gravity of the rear wheel comes forward.when using, it's flexible and light enough to move faster.
4) Handle and armrest can be detachable; 
5) Backrest for mesh sandwiches, removable, convenient cleaning;
6) Back with a adjustable according to individual demand, can adjust to the best state.