PVC Heat Shrink Tubing is a thin-wall, low cost material offering good electrical and mechanical characteristics. When exposed to heat in excess of 80 degree for a few seconds, the specially formulated polyvinyl chloride material will shrink rapidly and uniformly conforming to the shape of the object to be covered.Applications used for protecting or repairing the cover of 18650 batteries.Recommended use : multiple 18650 batteries together encapsulation, or four 18650 batteries parallel encapsulation.Notice: the battery is not included here.