Copper tape has countless applications in electronics from creating low-profile traces for electrical components to RF-shielding and antenna-making. Copper tape is even used to join things together using solder, like the stained glass on Tiffany lamps.
This copper tape is backed by a conductive adhesive, is 5mm wide and comes in rolls of 50 feet. Perfect for more precise projects.
The 5mm copper tape is a great option for making paper circuit traces. It's a better option compared to using the 2" copper tape. Here's an example from the Light Up Valentine Cards tutorial:
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The project I used this for was a partial success. Making consistently working connections was tricky and finicky. It worked eventually but it took many tries.