Sea Ties STCA Mainsail Centipede for up to 10-foot booms. Made of 8 feet of bungee cord and 5 white, cotton bungee sea ties (2 - 15" , 2 - 18", and 1 - 24" ). Sea Ties have a unique design features, natural cotton shock cord (bungee), brass clip, and varnished hard wood toggles. These straps (Sea Ties) have found their special niche in the sport of sailing. Whether used to secure your main sail when lowered, lash tiller, cinch jibs, secure anchor, or just securing boating accessories, Sea Ties are a handy strap to keep on board.