A new generation of thin-walled, flexible heat shrinkable tubes made of cross-linked polyolefin with a shrink ratio of 3:1 and packed in convenient storage containers. The main advantage is the possibility of using them for shrinking on elements with a large difference in diameter. In addition, five tubes of this type cover a range of diameters from 1.0 mm to 20.0 mm, which, when using tubes with a shrink ratio of 2:1, requires the use of 10 sizes. This allows us to significantly reduce storage costs. • Basic electrical insulation • Color coding • Protection against corrosion and mechanical damage