Okay so we have a chord that's metal with a plastic coating on it. Well we just got back from playing tennis Kallie will tell you about that . Anyways, we got back and Kallie was putting up a bike we brought and my puppy ran past her.She was like what I thought we weren't bringing her in. She chewed the chord in halve!!! So we had to get the actual chain from my daddy's shop so that's what she is on right now.