Product DescriptionPackage Content: 300Pcs Heat Shrink Tube1.Superior Quality and Stronger Shrinkage Ratio: Made of high quality polyolefin, 3: 1 stronger shrinkage ratio makes it more suitable for electrical insulation or related to open wire insulation or either.2.Usefulness: Heat Shrink Tubing Kit is great for any workshop project, fixing broken cables, electrical insulation, jumper wire, etc. You can also use it for allthe iPhone and iPad charging cable and headphone.3.Applied length and inner diameter: Heat shrink tube designed with same length 45mm inner diameter and multiple and 7 size: 2.4mm (65pcs), 3.2mm (80pcs), 4.8mm ( 50pcs), 6.4mm (50pcs), 7.9mm (35pcs), 9.5mm (10pcs), 12.7mm (10pcs).4.Safe and easy to use used: Heat shrink tubing has the advantages of good electrical insulation, good sealing and corrosion resistance, high temperature resistance. Shell the Bare Wire part with these tubes, heat it with soldering iron, heat gun or even hair dryer (hot enough), the tube to shrink protect the wires and give you a professional look of the repair job.5.What you get: 7size, 2 colors shrink 3: 1 ratio heat shrink tubes, total 300 pcs.