M500, Martin 12-String Extra Light Acoustic Guitar Strings:
Martin's M500 extra Light 12-string acoustic guitar set, made with 92/8 phosphor bronze wrap for warm tone. This alloy is 92% copper, 8% tin, and traces of lead, iron, zinc and phosphor. Martin M500s are less bright and a little warmer than 80/20 alloy guitar strings. The phosphor in the alloy helps them retain their new sound for extended tone consistency. This extra light set is easy on the fingers, yet yields full bodied 12-string guitar tone. Try some on your 12-string acoustic. Martin strings always deliver quality and satisfaction, and you can't beat the price for such great 12-string acoustic guitar strings.