The HellermannTyton Heat Shrinkable Tubing 3:1 on a Reel 18/6 red (part number 308-31802) is a flexible, self-shrinking plastic tube that provides professional, reliable protection of bundles, wires, and harnesses from moisture, dirt, and abrasion. Its highly shrinkable profile conforms easily to the shape of cables and components, providing a secure insulating seal in a variety of industrial and electrical applications. The 3:1 shrink ratio allows it to shrink down to one-third of its original diameter, providing improved strain relief and enhanced protection from environmental elements. The heat shrinkable tubing is supplied in a convenient dispenser reel for quick and easy application, and its smooth surfaces provide a neat, professional looking finish.