Formula for Calculating Custom Docklines Bowlines - 1 1/2 to 2 times beam Stern Lines - 1 1/2 to 2 times beam Spring Lines - 3/4 length overall Boat up to 30' - 1/2" diameter Boats 30' - 40' - 5/8" diameter Boats 40' - 65' - 3/4" diameter Transient docklines should be about 2/3 of the boats LOA when used on the Bow and Stern. Spring lines should be equal to LOA. Horizon's lines float, will not get caught in prop. Horizon's lines are multifilament fiber with solid braid for high strength Horizon's lines have built in memory, easy to work with Horizon's lines are made in the U.S.A. and have a one (1) year warranty against all manufacturers defects Horizon's lines are machine washable Horizon's line color is extruded into the fiber, not solution dyed Please allow a minimum of two weeks for delivery as we create your quality dock lines individually. Allow more time during "boat season", January thru March. Email firstname.lastname@example.org if you need your dock lines sooner. Thank you, we appreciate your business.