【DUAL WALL TUBING】 CUBEFELLER Heat Shrink Tubing adopts a double-wall design and adhesive lining. The outer wall provides extremely high abrasion resistance. While heating, the adhesive line will melt, and then it will be adsorbed on the surface of the object tightly, creating waterproof and long-lasting insulation. 【3:1 SHRINK RATIO】 Heat shrink tubing with a 3:1 Shrink Ratio, which can shrink to 1/3 of the original diameter, forming a tighter seal and eliminating the problem of 2:1 tubing not shrinking tight enough. The shrinkage temperature is 70° to 125°. 【INDUSTRIAL STRENGTH】 Heat Shrink Tubing has good electrical insulation (up to 600 voltage), good tightness, and corrosion resistance, high temperature resistance. and it is also waterproof, anti-aging, tough, and not easy to break. It's also UL and CSA certified and RoHS compliant and contains no harmful chemicals to protect you and your family. 【VERSATILE APPLICATIONS】CUBEFELLER waterproof shrink tubing can be used in marine and automotive wiring, model building, and DIY electrical wiring projects. The application areas are very diverse, such as electrical insulation/environmental sealing to protect against moisture, fuel and chemicals,protection of surfaces against abrasion, peeling and denting. 【 FAST & EASY USE】This kit includes 20pcs 1-feet long heat shrink tubing, which can meet your various needs. Just cut it to the length you need, slide it to the desired position, and then use a heat gun to heat it, so that the professional insulation connection is completed in a few seconds. CUBEFELLER Heat Shrink Tubing, trusted by millions of electricians around the world. CUBEFELLER waterproof shrink tubing can be used in marine and automotive wiring, model building, and DIY electrical wiring projects. The application areas are very diverse, such as electrical insulation/environmental sealing to protect against moisture, fuel and chemicals,protection of surfaces against abrasion, peeling and denting.