High Quality,Long service life High Strength Toughness Corrosion resistance Good electrical insulation High temperature resistance How to use it: 1. 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: 2:1 Operating Temperature: -55 Celsius to + 125 Celsius Minimum Shrinkage Temp: 70 Celsius Full Shrinkage Temp: 110Celsius maximum Dielectric strength: 15 kV / mm : Flame Retardant Colour:Black Material:Polyolefin Package Contents: 1x Total 625Pcs(8 Sizes) Heat Shrink Tubing 150x 1.57inch lengths 1/24inch 120x 1.57inch lengths 1/12inch 100x 1.57inch lengths 1/8inch 90x 1.57inch lengths 1/6inch 60x 1.57inch lengths 1/5inch 45x 1.57inch lengths 1/4inch 30x 1.57inch lengths 5/16inch 30x 1.57inch lengths 2/5inch 1x Plastic Box 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.