This heat shrink kit is very suitable for all project workshops, fixes the broken cables, electrical insulation, mechanical protection, wire bandwidth, wire connection, wire ends process, wire / cable connections, daily repairs, color coding etc.The retraction ratio of these heat shrink tubes is 2: 1, made of polyolefin, good electrical insulation or insulation of the open pipes or the connected.Heat shrink tube length: 45 mm, inner diameter: 1 mm / 1.5 mm / 2 mm / 2.5 mm / 3 mm / 3.5 mm / 4 mm / 5 mm / 7 mm / 10 mm / 13 mmMixed heat shrink sleeves with different colors: 5 colors (yellow, blue, black, green, red) in a 12 compartment organizer, happy for geeneral DIY home and auto electricity.easy to use, just cover the wire section with these pipes, heat it with a soldering iron, heat gun or even a hair dryer (hot enough), the pipe will shrink protect the cables and give you a professional look at the repair job