Lexco's bungee is intended for various tethering applications. WARNING: Our bungee is not load rated and is not designed for critical load applications. Safe stretch length is 150% of relaxed stretched length. Polypropylene is a general purpose bungee material which wears well outdoors. Nylon is a general purpose bungee material which is ideal for marine applications. Nylon bungee cord may degrade quicker than polypropylene in direct sunlight.