Polyolefin Heat shrink tubing can be used in a variety of applications in the military, commercial, and consumer markets. This product is UL recognized at 600V and under file No is E180908 or E345553. All heat shrink tubing will shrink lengthwise as well as its diameter; 2:1 shrink tubing will shrink one half of its nominal diameter and less than 7% of its length. Diameter: 1/4″ Length: 50ft Color: Orange