This assortment is particularly suitable for DIY enthusiasts, craftsmen, field service, service workshops, electronics technicians, and laboratory needs. You will receive a 300-piece premium heat shrink tubing assortment with a shrink ratio of 3:1 for a range of 1.6 to 12.7 mm in black, featuring hot melt adhesive on the inside: waterproof when properly overlapped. Thanks to the variety of sizes included, the heat shrink tubing sections can be used for insulation, protective covering of components, as strain relief, protection against corrosion, and for repairing cables and wires. Special feature: with internal adhesive.