The Vibration Dampers for Phantom 2 Vision Quadcopter from DJI is a set of four rubber dampers. Four dampers sit between the two halves of the Damping Bracket (available separately). The dampers provide a kind of suspension that helps isolate the gimbal from vibration incurred by the aircraft's motors, reducing translation into camera shake.
These parts are for the Phantom 2 Vision. They may not work correctly if used on other aircraft or with other cameras/gimbals.