Features： 1、1/2 Heat Shrinkage Ratio: The Heat Shrinkage Ratio of 2: 1 will shrink to 1/2 of the original size. The small tube is heated with a small fire, the large tube is heated with a hair dryer. The bag is convenient for organization and storage 2、Good Electrical Insulation: Has good electrical insulation, good sealing and corrosion resistance, high temperature resistance 3、Impermeable Seal: In particular, the heat activated adhesive lining provides an impermeable seal for salt water and other liquids, and has better performance when you and your child DIY 4、For Electrical Systems: Specially designed for use in electrical systems to repair, insulate and increase wiring strength 5、For Protection and Maintenance: Suitable for electrical insulation, wire bundling, mechanical protection, cable joints and daily maintenance, etc. Specification： Item Type: Heat Shrink Tubing Product Material: PE (polyethylene) Product Color: Black Working Temperature: -55℃ ~ +125℃ Shrinkage Ratio: 2: 1 Uses: Suitable for electrical insulation, wire bundling, mechanical protection, cable joints and daily maintenance, etc. Size: Approx. 2.0 x 40mm / 0.08 x 1.57in 2.5 x 40mm / 0.1 x 1.57in 3.5 x 40mm / 0.14 x 1.57in 5.0 x 40mm / 0.2 x 1.57in 7.0 x 80mm / 0.28 x 3.15in 10.0 x 80mm / 0.39 x 3.15in 13.0 x 85mm / 0.51 x 3.35in Package List： 30 x 2.0x40mm Heat Shrinkable Tube 25 x 2.5x40mm Heat Shrinkable Tube 20 x 3.5x40mm Heat Shrinkable Tube 20 x 5.0x40mm Heat Shrinkable Tube 16 x 7.0x80mm Heat Shrinkable Tube 8 x 10.0x80mm Heat Shrinkable Tube 8 x 13.0x85mm Heat Shrinkable Tube