1pc 29.5MM &brvbar;&micro;18.5MM PVC Heat Shrink Tubing For 18650 18500 Battery 5m(16.4 feet) Length:5m Shrinking temperature:80 Shrinkage ratio: 48% Flat diameter: 29.5mm (before shrinkage),Round diameter: approx. 18.5mm Wall thickness: 0.1mm (before shrinkage)