Top Quality & Stronger Retraction Ratio: Made of high quality polyolefin, 3:1 stronger retraction ratio makes it more suitable for electrical isolation or insulation of the open wires or the connected one. Comprehensive Applicability: Heat Shrink Tubing Kit is very suitable for any project workshop, fixing the broken wires, electrical insulation, wire connection etc. You can also use it for allthe and charging cable & headset. Applied Length & Inner Diameter: heat shrink tube designed with the same length 45mm and multiple inner diameter and 7 Size: 2.4mm(65pcs), 3.2mm(90pcs), 4.8mm(50pcs), 6.4mm(50pcs), 7.9mm(25pcs), 9.5mm(10pcs),12.7mm(10pcs). Safe & Easy Used: heat shrink tubing has the advantages of good electrical insulation, good tightness and corrosion resistance, high temperature resistance. Cover the bare wire part with these tubes, heat it with soldering iron, heat or even hair dryer (hot enough), the tube will shrink protect the wires and give you a professional look of the repair job! Colour:Black & White Material:Heat shrink tube Package Contents: 1 * Heat Shrink Tubing Kit Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.