Copper Foil Tape 8mm x 20m with Conductive Adhesive
Great for use with Chibitronics Circuit Stickers and suitable for any other application in place of regular wires. Also useful for EMI shielding. We've found the 8mm width to be perfect for kids – wide enough to resist accidental tearing, yet still narrow enough to create curved paths easily.
The adhesive is conductive, so two lengths of tape can be electrically connected just by sticking one on top of the other (no folding or soldering required). A version with non-conductive adhesive is available here.
See the Chibitronics copper tape tutorial to learn more about using copper tape with Circuit Stickers.