400PCS black heat shrink tubing kit, available in 7 sizes: 3/32 inch, 1/8 inch, 3/16 inch, 14/inch, 3/8 inch, 1/2 inch, 3/4 inch. 3: 1 Shrinkage ratio and rapid shrinkage speed: Shrink to 1/3 of the original diameter, seal extremely tightly, shrinkage temperature: 80 to 125 ° C, adhesive coating: When the heat shrink tube is heated, it will automatically release the adhesive and seal the connection extremely reliably. This creates a waterproof and durable insulation material. This creates a waterproof and durable insulation material that can be used for ship and car wiring, model construction, and DiY electrical wiring projects. The application areas are very diverse, such as electrical insulation/environmental sealing to prevent moisture, fuel, and chemicals/protect surfaces from wear, peeling, and dents.