headphones broken at the other end!

The headphones [วิ่งไม่หยุด: Sennheiser PMX 70 Sport] were broken at one end [วิ่งไม่หยุด: headphones gone bad ]. Now, it is broken at the other end near the 3.5 mm jack with the same symptom: broken plastic wrap. Yu-Shiang helped wrap it up with clear tap again. It looks ugly but it will work alright. I hope. How come it seems that the inner wires were shortened (by cold weather?)?!