Heat shrink is a polyolefin material in a tube form used to replace insulation or to be used in place of tape. Like that small piece I sent with that terminal end. You put it on wire or the terminal end, warm it up with a hair dryer and it shrinks and sticks to what its on and has insulation properties as good or better than the insulation it replaces. If I knew you didn't have any I would have sent a jag of the shit....