1、Premium Material: Keel rolleris made of premium PVC material, wear resistant, non marring, protects your boat's finish, sturdy and durable. 2、Function: Bow roller efficiently helps center and guide the keel of your boat on to the trailer for level and safe trailering, has a long service time. 3、Unique Design: Bow stop roller has embedded grooves, to automatically center the boat while the boat rolls forward, convenient and practical. 4、Excellent Performance: Professional manufacturing, exquisite workmanship, waterproof, stable performance and high reliability. 5、Simple Installation: The installation is simple, direct replacement the old one, no complicated operation is required, save your time and energy.