Martin MJI12T Era Jason Isbell Signature Acoustic Guitar Strings (12 54)

Features a patented Lifespan treatment to protect against corrosion Flexible Core construction to enhance fretability and comfort, and silk-wrapped ball ends Designed with vintage instruments in mind and as a premium touch that symbolizes Martin’s handcrafted string-making history Developed in collaboration with six-time GRAMMY winner Jason Isbell and features a more traditional SP core to match his signature guitar sound 12-16-25-32-42-54