D'Addario Acoustic Guitar Phosphor Bronze Environmental X Lite, .010 - .047, EJ15star rating 5Craig FishNovember 29, 2009I have tried just about every brand of acoustic strings available and finally settled on these D'Addario Acoustic Guitar Phosphor Bronze Environmental X Lite, .010 - .047, EJ15. They sound bright and full without shrill highs or boomy lows. Very well balanced. But they do require a bit of care and maintenance. You have to wipe them down after every session so they don't corrode and clean them with string cleaner at least once a week. With proper care these strings will last at least a month even with extremely heavy playing styles and lots of jam sessions in that month. Over all a very good buy and very reasonably priced.