This bundle includes three packs of Martin MA550S Authentic Acoustic Marquis Silked 92/8 Phosphor Bronze Medium 13-56 strings.Martin Guitar knows a thing or two about pampering valuable instruments. If youâ€re looking for some extra protection for your fne guitar, Authentic Acoustic Silked strings are the right choice for you. Weâ€ve adding a soft silk wrap to the ball ends of our Authentic Acoustic strings to prevent wear and tear on the bridge and bridge plate as you play. Our silk wrap puts a comforting layer of protection in place every time you change your strings. Available in 80/20 Bronze and 92/8 Phosphor Bronze.Gauges: 13-17-26-35-45-56