80pcs Heat Shrink Solder Seal Wire Connectors Kit, Flyoukki Low Temp Soldering Waterproof Sleeve Connector, Easy Splice Electrical Butt Terminals Tube, 10 Yellow, 30 Blue, 30 Red, 10 White

Edit: Support contacted me and gave me some tips and pointers on how to best use the product. I tried again with a small butane torch that can apply heat in a very small area and I had the same results - the heat shrink melted and failed before the solder could join the wires. While I cannot recommend the product, the support was outstanding and they have offered a full refund. Because of this, I would shop with this seller again for a different product. Updated review to 3 stars for customer service ONLY.Original:They do not melt at 140⁰. I had to use a heat gun to get the solder to melt and then the heat shrink failed and all the liquid solder came pouring out. Worse than just a butt solder joint and regular heat shrink - which is what I ended up doing. Those might work with a small butane torch for a smaller heat source but i only had a blow dryer and a heat gun at my disposal. If it wasn't a consumable, I would return it.

Very excited to try these. I used a heat gun and was worried I was going to burn the heat shrink because it does take more time than I expected for the solder to melt. But once it did, the connection seems great. I next tried a small butane torch and really had to work hard at getting the solder to melt - I think the torch was too directional heating in a small area not large enough to melt the solder. I was afraid I was going to burn the heat shrink, so I stopped with the torch and finished with the heat gun. Seems to work very well.

Nice

cheap junk dont waste your money too thin not marine grade strenght ,not worth the time solder iron and heat sink is your best friend nothing easy is better than the right way

Worked great for me. They definitely take longer to melt the solder than I thought. Used a heat gun on highest setting and just made sure to move it side to side to get shrink tube down first then a little time directly on the solder. Made quick work on complete rewiring of motorcycle lighting and ignition.

Great product, fast shipping. Made installation a breeze.

Very simple to use and literally no tools needed other than a heat source.Definitely recommend for wire splicing.

These work perfectly for what they are. In light-duty applications I don't see them ever failing.