Function: Tow ball cover completely encapsulates the trailer ball. your trailer hitch ball when it is not hitched up to a trailer with this hitch ball cover. keeping it shielded from exposure to harsh. Made with PVC for maximum durability. Anti-corrosion, wear resistance, good performance and high stability. How to Installation: This hitch ball cover is designed for maximum convenience, easy to installl, no additional tool is required. When it's time to hitch up your trailer, the hitch cover can be removed and conveniently stored in your glovebox. This trailer ball cover is with any 50mm diameter trailer hitch ball. colour: black Material: PVC Size: 60x57mm Package Contents: 1 x Towball cap cover Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.