These lights look spectacular when fully installed.  The down side (and upside) is that the absolutely minute size of the wires require extremely delicate handling, but disappears when installed in the signal bridges.  It took me several failed attempts until I finally came up with a solution to soldering that worked well.  (I am 71 and my hands are not what is probably best for such a product.)  Nonetheless, soldering them to 30 gauge colored wires and shrink wrapping the joints with 1mm shrink wrap worked well.  With the color coded wires I was able to keep the leads separated (I did triple heads on a signal bridge). and ultimately came up with a beautifully scaled and realistic set of bridges.  Be patient and steady and the end result will be well worth it!