Multiple sizes: This product includes 164 pieces of heat shrink tubing in 5 colours (yellow/blue/green/black/red) and 8 sizes (1.0mm/2.0mm/3.0mm/4.0mm/6.0mm/8.0mm/10.0mm/14.0mm), a wide range of sizes to suit your needs. High quality material: Made of cross-linked polyethylene, the heat shrink tubing has good insulation,soft and resistant to folding, shrinks quickly and is not easy to fall off, providing strong protection for your cables and eliminating leakage. How to use: Put the heat shrink tubing over the wire and connect the broken wire; wrap the wire with the heat shrink tubing and heat it with a hairdryer, lighter .etc. to make it wrap the wire tightly. Function: These heat shrink tubes have a shrinkage rate of 2:1, and when heated they fit the wire tightly and serve to connect the wires, protect the solder joints, and handle the resistance at the end of the wire. Applications: Heat shrinkable tube is wear-resistant, waterproof and air leak-proof, and can be used in electronic equipment, appliance harnesses, automotive harnesses, wires and cables, metal tubing, water pump wiring and other industries. Printing the number or name on the heat shrink tube can play the role of identification., Manufacturer: SZCXDKJ