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RockDIG 104Pcs 4:1 Heat Shrink Tubing Dual-Wall Adhesive Lined Tube Cable Wrap Sleeve Assortment Kit 6 Size(DIA) 4/6/8/12/16/20 mm Black. The heat shrink tubing is made of high quality polyolefin, 4:1 stronger retraction ratio makes it more suitable for electrical isolation. Dual-wall, adhesive lined, waterproof, excellent flame retardant and insulation performance, stable performance, long lasting insulation protection, shrinking fast. How to use it? 1. First choose the right size tubes, as it is 4:1 heat shrink ratio, it will shrink up to 1/4 of the original diameter. Pease measure and make sure the diameter of wire is equal or a bit larger than the size of tube after heat shrink. 2. Then insert the wires to the heat shrink tubing, use a lighter heating if the tube is small, heat guns heating for large one until the wire is wrapped tightly. 3. Don't touch the tube until it cool completely. Material: Polyolefin Shrinkage ratio: 4: 1 Starting shrinkage temperature: ≥ 70 ℃ Full shrinkage temperature: ≥125 ℃ Operating temperature: -45 ℃ to 125 ℃ Tensile strength: 10.4Mpa Dielectric strength: 15 kV/mm Flammability: Flame Retardant Package Includes: Φ4mm - length 1.77", total 48pcs; Φ6mm - length 1.77", total 32pcs; Φ8mm - length 3.50", total 6pcs; Φ12mm - length 3.50", total 6pcs; Φ16mm - length 3.50", total 6pcs; Φ20mm - length 3.50", total 6pcs; Plastic storage box - 1pcs