Tie Down Poly Vinyl Non-Marring Trailer Bow RollerTie Down Poly Vinyl Rollers are long lasting, will absorb shock, are cut resistant and will not mark or mar your boat. Tie Down's enhanced formula for PVC far outperforms traditional polyurethane products. Tie Down's Poly Vinyl rollers are manufactured to withstand both salt water and freshwater conditions.Features: For 1/2" diameter shafts; Lifetime guarantee; Made in the USA;