CONNECTORS have wide applicability in AC, DC, outdoor/indoor low voltage repair, automotive, marine, boat, motorcycle, truck and trailer electrical wiring. They can also be used to repair or splice USB cables, speaker wire, headphones, toys and much more.Our Solder seal is designed to withstand high levels of stress and have a tensile pulling force greater than 22 pounds. Wire must be TWISTED together before applying solder sleeves. Enhanced wire protection, IP67 WATERPROOF and submersible wire connectors, advanced anti corrosion sealing for guaranteed WATER RESISTANCE.CLEAR and TRANSPARENT solder seal wire connectors can be bent to fit tight and confined spaces.USER FRIENDLY design, color coded for easy identification. What's more, you'll receive 10 BONUS connectors and a practical storage case. No need to worry about cracked insulation due to crimping or loose crimp connections.Just slip one of the wires you want to join, twist the two wire strands together, and then slide precisely over the wire joint.All you need is a heat gun (recommended) or a flame (not recommended) to shrink and bond your spliced wires together. In some cases, solder ring will be left after the tin has melted, but it doesn't mean the tin ring is not melted and has failed. As long as there's enough tin melted with the copper strands then it'll hold up strongly, it's unnecessary to pursue 100% meltdown of the solder ring. Shrinkage ratio is 2:1 Temperature that solder seal starts to shrink: 80 Celsius Temperature that solder ring starts to melt: 111 Celsius Temperature that solder ring melts completely:138 Celsius No need for a soldering iron. No more fumes, no more burns, and no more clutter just to connect two wires together. You can stretch wires to test after the connection cools down. colour:Blue + yellow + white + red Material:plastic size:3x1x1cm 70 x White Connectors: Diameter 1.7 mm, Cable cross-section 0.25-0.34 mm² (A.W.G.:26-24); 70 x Red Connectors: Diameter 2.7 mm, Cable cross-