🌄YIWANSON Dual-Wall Ratio 3:1 Colored Marine Grade Industrial Electrical Waterproof Wire Shrink Wrap Tubing With Adhesive Sleeves Insulation Multicolor Large Tubing Kit Specification:Material: PolyolefinQuantity: 48pcsLength: 1.77"(4.5cm)Diameter: 6.4mm, 7.9mm, 9.5mm, 12.7mmShrinkage Temp: 70℃Full Shrinkage Temp: 125℃maximumTensile strength: 10.4MpaFeature:Safe & ECO-Friendly: Heat shrink tubes are made of high quality Polyolefin, electrical insulation, corrosion resistance and high temperature resistance, long-lasting, they are also RoHS Compliant, protect you and your famaily from toxins.DIY Helper: Multiple sizes heat shrink tubing for your choose, they can be used for solder joint protection, group of lines marking, resistance electric capacity reason protection etc. Easy to Use - Simply slide heat shrink tube over your connection point and apply heat. Professional connections made in seconds. Grouping loose wires, creating thermal insulation for heat sensitive components,protecting surfaces against abrasion, peeling, and denting.Package includes:🌟12pcs x 6.4mm. Black, Green, Blue, Red, Yellow, White each 2Pcs.🌟12pcs x 7.9mm. Black, Green, Blue, Red, Yellow, White each 2Pcs.🌟12pcs x 9.5mm. Black, Green, Blue, Red, Yellow, White each 2Pcs.🌟12pcs x 12.7mm. Black, Green, Blue, Red, Yellow, White each 2Pcs.🌟Total: 48Pcs Waterproof Heat Shrink TubingHow to use it? 1. First choose the right size tubes, as it is 3:1 heat shrink ratio, and will shrink up to 1/3 of original diameter. 2. Wrap the cable wire with the tube, then use a heat machines heating it until the wire was wrapped tightly. 3. Don't touch the tube until it becomes cool. If there is a problem, you can heat it again to correct it.