Martin Marquis M-1600's produce a bright and ringing 12-string acoustic guitar tone, thanks to 80/20 bronze alloy windings. The alloy is 80% copper and 20% zinc, which is well know for its brilliant tone. They feature a silk wrap at the ball ends, which reduces wear on bridges and bridge plates. M-1600's are an "extra light" gauge set, which is easy on the fingers, making chords a snap. They will bring out the classic 12-string acoustic guitar sound and reward you with hours of joyful playing. What else would you expect form C. F.Martin, a name renowned for fine acoustic guitars and guitar strings.