High Quality,Long service life High Strength Toughness 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 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 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: 3x Total 625Pcs(8 Sizes) Heat Shrink Tubing 450x 1.57inch lengths φ1/24inch 360x 1.57inch lengths φ1/12inch 300x 1.57inch lengths φ1/8inch 270x 1.57inch lengths φ1/6inch 180x 1.57inch lengths φ1/5inch 135x 1.57inch lengths φ1/4inch 90x 1.57inch lengths φ5/16inch 90x 1.57inch lengths φ2/5inch 3x Plastic Box Only the above package content, other products are not included. Note: Light reflection 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.