A new generation of thin-walled, flexible heat shrinkable tubes made of cross-linked polyolefin with a 3:1 shrink ratio and packaged in convenient storage containers. The main advantage is the ability to be used for shrinking on elements with a large diameter difference. In addition, five tubes of this type cover a range of diameters from 1.0 mm to 20.0 mm, which with the use of 2:1 shrink ratio tubes would require the use of 10 sizes. This enables significant reduction in storage costs. • Basic electrical insulation• Color coding• Protection against corrosion and mechanical damage