Martin Guitar knows a thing or two about pampering valuable instruments. If you’re looking for some extra protection for your fine guitar, Authentic Acoustic Silked strings are the right choice for you. They’ve adding 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.
Martin Authentic Acoustic strings are engineered with the performer in mind and they will always stand up to rigorous practice and performance schedules. 
Martin start with their highest tensile-strength core wire, then tin-plate it on all six strings for added corrosion resistance; because what you don’t see matters. When coupled with the highest quality wrap wire you get consistent true tone that you can count on song after song.

12-string Extra-Light gauge: 10-10-14-14-23-10-30-12-39-18-47-27