Donerre does not use shim stack for compression and rebound, but a unique technology, specially developed by Donerre.
Hydro bump stop
Donerre's hydro bump stop is characterized by its effective and progressive action, it permits to preserve the mechanical, it improves the rebound phase after bottoming and iti ncreases comfort and security felt in case of a violent impact.
Hydro rebound bump
This hydro rebound bump system is included in all Donerre dampers; it avoids any violent mechanical contact when the wheel goes to the fully extended position.