This is the Maverick American 100&'; Norprene Tuna Bungee Float Heavy Duty Features: Neoprene w/1000lb spectra inner line For Blue water hunting large pelagic fish Offers maximum 3 x stretch (180&';) shock absorbing perfection Neoprene 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. Our new 100&'; neoprene bungee uses 3/8 inch (9.6mm) tubing combined with 300&'; of 1000lb Dyneema core, broken into 2 sections of 50&'; each. The shock absorption qualities of the neoprene 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.