The key element in the air spring is the rubber bellows. It essentially determines the comfort and service life properties. Vibracoustic offers three different types of bellows. They differ in terms of the structure of the reinforcing fibers embedded in the bellows. With an axial bellows, the fibers embedded in the elastomer run axially to the deflection direction. In contrast to this, the cross-ply bellows has two intersecting layers of reinforcing members, but they are not connected as opposed to a fabric. The newly developed cross-axial bellows, or ZAX bellows, combines the good torsion decoupling capability of the axial bellows with the dimensional stability of the cross-ply bellows.