The DJI Damping Rubber is a set of rubber cushions that sit between the brackets included with the damping unit (available separately). They are designed to help absorb vibration generated by the aircraft motors so that it won't be translated into shaky camera footage. These dampers work with the Zenmuse H3-2D, H3-3D, and H4-3D gimbals.
Reviews DJI Damping Rubber for Zenmuse H3-2D / H3-3D / H4-3D Gimbal