If you’re looking for some extra protection for your fine guitar, Authentic Acoustic Silked strings are the right choice for you. Martin has added a soft silk wrap to the ball ends of their Authentic Acoustic strings to prevent wear and tear on the bridge and bridge plate as you play. The silk wrap puts a comforting layer of protection in place every time you change your strings. 80/20 Bronze - Medium .013 .017 .026w .035w .045w .056w