The ROSTA double suspension units type AD-P/AD-C are used for suspending and supporting two-mass shaker systems. The centre point, for frame fixation, is in the middle of the double rocker arm.

The AD-C model is designed to be frictionally engaged in the same way as the AS-C type. The housings and the inner square sections are made of welded steel. The inner square section of the AS-C type is made of aluminum profile.