Adhesive-lined shrink tubing -
3:1 - Flexible Polyolefin, shrinks down to 33% of its original size when heated with a heat gun to a minimum temperature of 250°F (121°C).
“Best style of heat shrink tubing, in that it’s lined (inside) with a type of glue that melts with heat and sticks to the captured rope far better than standard heat shrink tubing!”