High Quality,Long service lifeHigh Strength ToughnessCorrosion resistanceGood electrical insulationHigh temperature resistanceHow to use it:1. First choose the right size tubes, as it is 2:1 heat shrink ratio, and will shrink up to 1/2 of diameter.2. Wrap the cable wire with the tube, then use a heat heating until the wire was wrapped tightly.3. Don't Press the tube until it becomes cool.Specification:Heat shrink ratio: 2:1Operating Temperature: -55 Celsius to + 125 CelsiusMinimum Shrinkage Temp: 70 CelsiusFull Shrinkage Temp: 110Celsius maximumDielectric strength: 15 kV / mmFlammability: Flame RetardantColour:BlackMaterial:PolyolefinPackage Contents:2x Total 625Pcs(8 Sizes) Heat Shrink Tubing300x 1.57inch lengths 1/24inch240x 1.57inch lengths 1/12inch200x 1.57inch lengths 1/8inch180x 1.57inch lengths 1/6inch120x 1.57inch lengths 1/5inch90x 1.57inch lengths 1/4inch60x 1.57inch lengths 5/16inch60x 1.57inch lengths 2/5inch2x Plastic BoxOnly 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.