Higher Quality and Stronger Shrink Ratio: Made of high quality polyolefin, 3:1 stronger shrink ratio makes it more suitable for electrical insulation or related to open wire insulation or one. Complete utility: eventronic heat shrink tubing Kit is very suitable for any workshop project, fixing the breakage of cables, electrical insulation, connecting wire, etc. You can also use it for allthe iPhone and iPad charging cable and headphone. Applied length and inner diameter: Eventronic heat shrink tube designed with the same length 45mm and multiple inner diameter and 7 size: 2.4mm (65pcs), 3.2mm (80pcs), 4.8mm (50pcs), 6.4mm (50pcs), 7.9mm (35pcs), 9.5mm (10pcs) , 12.7mm (10 pieces). Safe and easy to use: eventronic heat shrink tubing has the advantages of good electrical insulation, good sealing and corrosion resistance, high temperature resistance. Cover the bare wire part with these tubes, heat it with soldering iron, heat gun or even hair dryer (hot enough), the shrink tube will protect the wires and give you a professional looking repair job. p> What you get: 7size, 2 colors shrink 3:1 ratio heat shrink tubes, total 300 pcs.