Single holed (preshrunk) ends eliminates improper fiber threading. method to increase the cable outer diameter and thickness. The additional thickness of a heat shrink tube allows the crimp ring to bite into it, increasing jacket pull and twist performance. Standard colors are WHITE and YELLOW. Label wrap: Clear plastic sheet with adhesive backing. The most common are Brady brand. excessive pulling, bending, and crushing forces. Do not crush the cable or allow it to. Heat shrink tubing is a versatile plastic layer which can be applied to cabling and components for several purposes by electricians, engineers and similar professionals, including: They are also known as heat shrink sleeves, in particular when used with cables.