Martin M180 12-String 80/20 Bronze Acoustic Guitar Strings Extra Lightstar rating 5Stuart EdgeApril 19, 2010I have been using Martin M180 extra light for 28years although I have tried many makes I have used M180 consistently for 20years on my 12 string which I play all the time. These strings ring out beautifully and many times a night bring out of me a smile of total satisfaction as the chords sound wonderful with my singing, and my confidence soars. Without a doubt 100% SATISFACTION guaranteed never found fault with any string and many from the audience compliment me on my 12 string sound and I am just a strummer