Strong, attractive, does not obstruct view. Mounts with durable cast-aluminum, powder-coated bases with built-in cleats. Acts as spring to maintain boat at safe convenient distance away from dock preventing impacts caused by waves or wakes. Includes: double braided nylon whip lines, spring lines & stainless steel mounting hardware. Exclusive "Plug & Socket" Design was developed for quick, easy separation for convenient storage. NOTE: Some mooring areas may be too rough for any type of tie-up system. Weight is more critical than boat length when selecting correct size of whip.