Does anyone know what Kind of material this is made out of, or how they even put it on the hook. Eagle claw and some other companies have been using this and it works really well at keeping soft plastics on the hook. It doesn’t seem like rubber like from shrink tubing, it’s kind of a very very thick hard plastic and it doesn’t budge. I’ve tried using the best shrink tube I could find and it doesn’t even compare. It stays flexible and even the shrink wrap with the glue inside Still slides up and down the hook eventually. If I can figure it out, I would like to use it on my jig heads.