Poly Vinyl, Non-Marring Bow Roller Assembly Tie Down Engineerings Bow Roller Assembly makes replacing damaged or worn bow rollers easy. Amber colored poly bow roller assembly includes end bells and bolt. New poly vinyl rollers are long lasting, will absorb shock, are cut resistant and will not mark or mar your boat. Tie Downs enhanced formula for PVC far outperforms traditional polyurethane products. Assembly includes one bow roller and two end bell rollers on a 12 zinc plated bold with lock nut