Martin Acoustic SP MSP4200 Phosphor Bronze Medium Strings
Martin acoustic guitar strings. Medium gauge phosphor bronze .013 to .056
SP (Studio/Performance) series strings are made by Martin Strings craftspeople from an ultra-high quality steel core that resists breaking much better than average strings.
Both the core and the plain strings are plated with a smooth acoustic bronze finish. They stay bright, have long lasting tonal qualities, and look absolutely beautiful on a guitar.
E 1st .013
A 2nd .017
G 3rd .026
D 4th .035
A 5th .045
E 6th .056