Martin MA540 Light 12-54 Phosphor Bronze SP Acoustic Guitar Strings

Superior Performance

Martin Authentic Acoustic SP strings feature a higher tensile strength and tin-plated core wire on all six strings that enable a fuller and more balanced tone, quicker response and increased tuning stability. 

Martin Phosphor Bronze Strings are composed of 92/8 copper to tin and give a warmer, clean and well-rounded. tone