Martin MP535T Era Acoustic Guitar Strings Custom Light (11 52)

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 .011-.052