This is the Maverick America Norprene Bungee Trail Line or Float Line Features: Our new Norprene Bungee comes with 10&'; and 20&'; trail line or float line. On the terminal side we use a Large Tuna clip on one end that&';s ideal to attach to the float system, and a 500lb ball bearing snap swivel to attach to the gun handle in a streamline manner. The shock absorption qualities of the norprene system used in conjunction with a float system of the right size provide very forgiving recoil properties, which help, reduce the risk of ripping off trophy fish. Norprene is the standard for blue water hunting bungee applications. First used by Blue Water Hunting pioneers like Terry Maas during the 1980&';s for the pursuit of Giant Tunas Norprene&';s properties offering gradual resistance and stretch to 150% (x2.5 original length) of its original length."