A biodegradable polymeric blend is provided, which can be produced by extrusion and contains at least one partly aromatic polyester, as well as aromatic and aliphatic blocks. The adjusting module has a plurality of adjusting plates that are combined by the guide-grooves and guide-pins. In the event of a damping force arising on the arrangement’s piston in a certain direction of the piston, an operating device with valves and pipes is arranged to ensure that there is an increase in pressure on the side of the piston facing towards the direction, while the pressure is essentially maintained on the side of the piston facing away from the direction.