50 PCS Solder Seal Wire Connectors Heat Shrink Solder Butt Connectors Waterproof Insulated Electrical Butt Splice Wire Terminals Automotive Marine Terminals, Yellow 12-10 AWG Features: 1 of transparent polyolefin tube with solder and hot melt adhesive inside. 2mum temperature for solder to melt 280°F / 138°C, For tube shrink temperature: 176°F / 80°C 367 Waterproof,Insulated,Durable Corrosion Prevention. 4age includes 50pcs Solder Seal Wire Connector 5ly applied in cables, automobiles, ships, motorcycles, household appliances, etcNote: 1. Recommend to use a hot air gun to heat. Rotate the connector to make sure evenly apply heating. 2. Please set the temperature from low to high gradually when operation.