Ehr... JEFryar, you seem to be the only one who is not taking this topic lightly. We are in the topic ''Learning to sail''. Part of learning to sail is to learn boat husbandry and proper terminology. I think it was as very appropriate to point out that non-marine grade shock chord often does not have UV protection and often have steel hooks that leave rust stains. I also think that at least in U.S. sailing circles ''shock chord'' is the proper name for the material that in other sports might be called Bungee Chord. When people come here in good faith to share ideas and learn then it is incumbent on those of us who respond to posts to at least try to provide accurate information. While you or the fellow who first asked the question might elect to eschew traditional nautical vocabulary and materials, it stills seem appropriate to provide the information based on our own experience and knowledge.