JBL 50' Sea Vine Stretchable Spearfishing Float Line JBL 50' Sea Vine Stretchable Spearfishing Float Line Constructed with a 3/8 closed cell neoprene internal core Encapsulated in a high tensile, stretchable polyester over-braid 50ft of line - Has a break strength of over 1800 lbs. House Of Scuba Is An Authorized JBL Dealer!