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Heat shrink tubing is an inexpensive way to insulate, protect and color code wires and cords around the office and home. The tubing has a very diverse function and is used for many industries, including telecommunications, military, automotive and electronics. When purchased, heat shrink tubing is a flexible material that is then wrapped around a wire and shrunk to fit like a second skin. The shrinking occurs when heat is applied to it, either by a special heat-shrinking gun or an ignition torch. Special caution should be taken when applying heat to any wires. Never apply shrink tubing to a cord that has electricity currently moving through it.