When exposed to heat, the tubing completely encases the cable and shrinks. This protects the cable from weather influences and mechanical damage. This set includes tubes with four different diameters, two different lengths, two different colors, and two different shrink ratios, making them versatile for various applications. The handy box is ideal for protecting the shrink tubes, keeping them free from dirt and dust. The box can also be reused for storing various tool accessories, such as screws and nuts. The shrink tubing can be heated with a heat gun; when heated, the tubing shrinks to half its original diameter with a shrink ratio of 2:1 and to a quarter of its original diameter with a shrink ratio of 4:1.