Heat Shrink Tubing are hollow tubes of woven material with both ends open. These tubes become smaller in size as they warmed by hot air or a flame. Most often used as insulation material when connecting wires together, these tubes can be used to group wires together, or insulate items from mechanical wear plus a lot more. The shrinking ratio ranges from 1.2:1 to 6:1 with lengths from 0.031’ (9.52mm, 0.38”) to 6562.0’ (2000.0m) and an inner diameter ranges of 0.014” (0.36mm) to 11.220” (284.99mm).