Fangrui Product Details 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. Dont 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: L