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 a whopping 50mm wide, and comes in rolls of 20 meters. That's a lot of copper.
Copper foil thickness: 0.065mm