AIRNIX 200 Piece Assorted Heat Shrink Solder Sleeve Crimpless Butt Splice Connectors 200 Piece Set...100 White, 70 Red, 20 Blue, 10 Yellow Easy One-Step...Apply Heat to Create a Soldered, Insulated Waterproof Seal PolyolefinHeatShrinkSolder Seal ButtConnectors forImprovedPulloutStrength and StrainRelief Ideal for use in Marine and Automobile Applications Recommended for those Experienced Using a Heat Gun to Make Heat Shrink Connections