2m/6.5 feet 29.5MM &Phi;18.5MM PVC Heat Shrink Tubing Wrap for Li-ion 18650 18500 Battery (Blue) Length: 2 meter/6.5 feet Shrinking temperature: 80 Shrinkage ratio: 48% Flat diameter: 29.5mm (before shrinkage) Round diameter: approx. 18.5mm