This is the replacement Wrap shrink insulator PVC skin for 18650 battery.
Product name: PVC heat shrinkable tube 18650 PVC heat shrinkable casing batteries.
Product specification: length of 72 mm, width flattening 30 mm,
The wall thickness of 0.5mm
Product color: as the picture
Comes as One Wrap Skin
This is what I have been looking for..