As you maneuver your RV at particularly low speeds or when backing up, the standard lube disk will serenade you with a percussive melody. This is because the material is soft and its lubricity is inconsistent. The moise is caused by the hitch actually being jerked within the mounting rails. One can normally only hope that the jerking is not damaging any towing equipment. To stop this jerking and accompanying noise install our Whisper disk. It will stop it for good and best of all, this is the last lube plate you will ever need. They are maintenance free and permanently lubricated.