[Made to Last with Premium Rubber Material] Our Chock is made from material in a one-piece molding, making it super heavy duty and to oil, water, gasoline, propane, and hydraulic fluids. Rest that your Jack Wheel be protected for years to come. [Ultimate Protection for Jack Caster Wheels] duty Chock is specially designed for Jack Caster Wheels, providing ultimate protection and preventing rolling or sinking into soft ground. It also ensures stability once your caravan is in its stationary position, making it the perfect solution to your trailer tongue problems. [Extend the Service Life of Jack Wheels]Place the Chock underneath your Jack Wheel to prevent damage from mud, sand, oil, and dirt. The drainage hole effectively prevents rainwater build-up and rust damage. With the jack wheel chock, your Jack Wheel and its service life be prolonged. [Odorless and Easy to Store]Treated with high temperature vulcanization, our chock is , odorless, and . It can endure extreme outdoor temperatures without losing its effectiveness. With a portable size of 6.6 inches x 5 inches x 1.6 inches, it is easy to store in your car for convenience. [ Wheel and Rubber Chock]Our Chock features a poly wheel and a heavy-duty rubber chock, providing long-lasting resistance and ensuring the stability and safety of your trailer. Color: Black Material: Rubber Package Contents: 1 * Jack wheel block Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.