Features : 1. These High-quality heat shrink butt splice connectors for wire connection that provides excellent waterproof sealing and protection from mechanical damage combined with Anti-Corrosion effect. 2. Just heat these solder seal wire connectors and they will easily connect both sides of the wires and seal them up to make a reliable waterproof connection. 3. The outer layer of connector tube is made from polymer that shrinks under the heat and two glue compound circles on both sides of a tube which will seal the connection and will make it waterproof. 4. For best results we recommend the use a heat machine 5. No wire damage due to low shrink temperature Specification : Shrink ratio 2:1 Minimum recommended shrink temperature: 80 degrees Celsius / 176 degrees Fahrenheit. Minimum recommended solder melting temperature: 138 degrees Celsius/ 280.4 degrees Fahrenheit Protection level: IP67 red: for cable cross section 0.5-1.5mm (AWG 22-18) blue: for cable cross section 1.5-2.5 mm (AWG 16-14) yellow: for cable cross-section 4.0-6.0mm (AWG 12-10) white: for cable cross section 0.25 - 0.5mm (AWG 26-24) Weight: about 100g includes: Choice 1: 120pcs x Wire Splice Connector Choice 2: 50pcs x Wire Splice Connector Choice 3: 100pcs x Wire Splice Connector "