Martin
- MA540 Authentic Acoustic SP 92/8 Phosphor Bronze Light (.012–.054)
Martin MA540 Authentic Acoustic SP 92/8 phosphor bronze acoustic guitar strings, .012 to .054 (Light). Made in Nazareth, PA. The string Martin uses to set up its own dreadnoughts at the factory, and the working canon for bluegrass, folk, and singer-songwriter pickers.
- MA540FX Authentic Acoustic Flexible Core, 92/8 Phosphor Bronze Light (.012–.054)
Martin MA540FX Authentic Acoustic Flexible Core phosphor bronze acoustic guitar strings, .012 to .054 Light. Tommy Emmanuel's touring set, branded Tommy's Choice on Martin's own site, built with a thinner core wire for easier bending. Made by Martin in the USA.
- Authentic Acoustic Lifespan 2.0 Phosphor Bronze Medium (.013–.056)
Martin MA550T Authentic Acoustic Lifespan 2.0 phosphor bronze guitar strings, .013-.056 Medium. Anti-corrosion treated. Ships stock on the 2026 D-18 Molly Tuttle.
- SP Phosphor Bronze Light
Martin SP Phosphor Bronze Light reviewed: warmth, projection, break-in, and who uses them across country, folk, singer-songwriter, and fingerstyle.