Marine grade flexible white PVC, will not chip or crack under normal usage and is unaffected by gas, oil or saltwater. UV stabilizers prevent yellowing and deterioration. Stainless steel fasteners recommended, sold separately. Length 25' Roll Unique design allows mounting for any application. Mount flat on dock, as a heavy-duty double wall fender, or as a corner protector. Can be used on pilings or on docks manufactured from 1" or 2" boards with no side trim. Mounts easily over the edge of deck boards. Prevents boat damage during docking.