This boat trailer roller material is thermoplastic polyurethane elastomer(TPU), is one of polyurethane types. From the process, thermoplastic type used the injection type craft
Will not Rust or Will not Mark your Boat.Bow Stops protect and cushion boat hulls when secured against bow stop brackets
Designed to support the weight of your boat on the trailer; absorbs road shock
End bells ensure that the boat does not scrape against bolts or roller bracket.Bow bell assemblies help to center the boat and prevent bow to bowstand contact