FOR ACOUSTIC-ELECTRIC GUITARS WITH PIEZO PICKUPS UNDER THE BRIDGE OR MAGNETIC PICKUPS IN THE SOUNDHOLE. ALSO FOR FULL SIZE ARCHTOP JAZZ GUITARS WHICH RESPOND TO ZEBRAS WITH RICHER TONES ACCORDING TO PLAYERS. ANY AMPLIFIED ACOUSTIC COMES ALIVE WHEN YOU PUT ON ZEBRA STRINGS. REVOLUTIONARY BECAUSE NO OTHER COMPANY CURRENLY MAKES THIS TYPE OF STRING. IT IS THE VERY FIRST STRING WHERE YOU CAN SEE THE DIFFERENCE.