80 / 20 BRONZE. You can select the option you prefer at checkout. Extra Light.
Martin Bronze Acoustic Guitar Strings 12 - 54 10 - 47 11 - 52 13 - 56
Martin MA500 12 String Extra Light 10-47 Phosphor Bronze Acoustic Guitar Strings
Martin M170 Extra Light 80/20 Bronze Acoustic Guitar Strings 10-47 Complete set
Martin MA180 Acoustic Guitar Strings Bronze Extra Light 12 STRING SET 10 - 47
Martin Darco 80/20 Bronze 10-47 Acoustic Guitar Strings D510
Martin MA170 Acoustic Guitar Strings SP 80/20 Bronze Extra Light, 10-47
