Heat shrink tube is a shrinkable plastic tube used to insulate wires, providing abrasion resistance and environmental protection for stranded and solid wire conductors, connections, joints and terminals in electrical work. Here we have heat shrink tube of varying diameter,

You can choose any one of them as per your need. You can also get Heat Shrink Combos and Splices. It can also be used to repair the insulation on wires or to bundle them together, to protect wires or small parts from minor abrasion, and to create cable entry seals, offering environmental sealing protection.