ZEBRA? electric-acoustics! Yes, for acoustic-electric guitars with piezo pick-ups under the bridge... or magnetic pickups in the sound hole. Any amplified acoustic comes alive when you put on the ZEBRA? strings. Revolutionary because no one has ever done this before, and no one else does it yet. It is the very first string where you can see the difference. Every other coil is nickel-plated steel, every other coil is RARE? phosphor bronze... wound on hex cores. Gauges: .011; .015; .022; .030; .040; .050