Black Heat Shrink Tubing Adhesive Lined 4:1 Ratio Marine Grade Waterproof Wire Shrink Wrap Tubing Insulation Seal (Black)

4:1 Heat Shrink Ratio: 4:1 Heat shrink tubing will shrink to 1/4 of its original diameter after heating. 4:1 is a higher shrinkage than 2:1. A Higher shrink ratio allows the tubing to fit more tightly on objects. Dual Wall Shrink Tubing: 4 to 1 shrink tubing comprises two different layers. The outer layer is polyolefin and the inside layer is made up of an adhesive that will melt when heated. The adhesive lining can bond with different materials. Waterproof Sealed Heat Shrink Tubing: Dual wall heat shrink tubing has an adhesive lining that can completely encapsulate the wire or cable to achieve a waterproof sealing effect. Multiple Application Scenarios: Because of stronger protection and electrical insulation, 4 to 1 heat shrink tubing can be used in automotive, wire connection, and electrical DIY. It is suitable for insulation and sealing protection of various irregular shaped objects. Variety of Sizes: The measured size is circular diameter, not flat. We offer 5 different diameters and 3 different lengths of black heat shrink tubing, which meets your various needs. The diameter you choose is 1/2" and the length of shrink tubing is 12 feet.