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 2" wide, and comes in rolls of 50 feet. That's a lot of copper.
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If you are doing any kind of compliance testing on electronics (compliance with CFR 47 part 15 is required by law for electronic products with oscillators or crystals folks!) this is a must. I do wish they also had 1" width.