Keep those cells safe! These ring insulators are made of barley paper (aka fish paper) with an adhesive backing, and come in a dark green color. They can be used inside or on top of heat shrink, and are an easy peel-and-stick.
These are approximately 21mm OD, 12mm ID and 0.3mm thick.
This is for a set of 20 insulators.
Note:
-Colors may be slightly different than those shown in the photos. The green is a darker tint, and may appear to be black in the photos.
-May come in PVC instead of paper