Tie Down Black PVC Wobble Roller Kit The Tie Down Black PVC Wobble Roller Kit is ideal for a variety of boats and trailers. The wobble rollers included in this kit are ribbed and made of a high-quality, poly-vinyl material that is cut and fade resistant. These rollers are designed to protect the boat from markings and absorb impact while withstanding both salt water and freshwater conditions. Tie Downs PVC rollers are backed with a lifetime guarantee and are proudly made in the USA. Specificatio