Martin Find Your Acoustic Guitar Strings - Assorted VarietyAssorted Variety Includes: Martin MA140 Treated 12 54 Light 80 20 Bronze Acoustic Guitar Strings 41Y18MA140T Martin Authentic Acoustic MA130 11. 5 47 Custom Light Silk and Steel Acoustic Guitar Strings MA130 Martin MA530 Extra Light 010 047 Phosphor Bronze Acoustic Guitar Strings MA530 Martin MA550S Silked Phosphor Bronze 92 8, Medium 13 56 Acoustic Guitar Strings MA550S Martin MA540 Light 12 54 Phosphor Bronze Acoustic Guitar Strings MA540