NOTICE : Rubber belt has a little bounce (can be stretched 10mm)，you can choose a similar size. Measurement method: If the belt is complete, you can flatten the belt after folding straight to measure the length of folding; if the belt is broken, you can directly measure the total length of the belt; if the belt disappeared, you can use the wire around the belt path, and then the amount length of the outgoing line is the length of the belt.