Dingcheng muab kev co dampers thiab cushioning nres nyob rau hauv ntau qhov ntau thiab tsawg thiab rau ntau yam qauv; xws li cylindrical, waisted, conical thiab parabolic. Lawv feem ntau yog tsim los ntawm 55 degree Shore roj hmab, tab sis lwm yam hardnesses muaj nyob rau ntawm kev thov.