These are similar in size to bright white LED's I have used in the past for locomotive lights or street lights. Small but still big enough for me to handle and solder the magnet wires to.
This is the type of wire that is used for motor armatures, relay or solenoid coils, etc. The darker red color is actually an insulating enamel that is very thin. so this type of wire is commonly know as magnet or enameled wire.
The enamel on the wire can be scraped or filed off on the ends so that solder can stick to copper wire itself.
Before installing the LED and wires a short section of 3/32 brass tube and a brass washer were added near the bottom setting the finished height of the signal.
To mount these signals I drilled a 1/8 inch hole in the bench work and after feeding through the wires the pole was secured with E6000 adhesive.
These signals were connected to the same relays for the helix that control the oversized signals at the other end in the staging yards.
These signals were rather inexpensive to make, maybe 5 or 6 dollars each for materials but they are a bit of work and are not as good looking or detailed as some that can be purchased. As I expand signaling to other areas of the layout I may also try out some of those ready to run signals.