Type: Flat Top Year of Manufacture: 2020s Brand: Martin I'm selling this because I've started using bronze strings. MA540T AUTHENTIC ACOUSTIC LIFESPAN 2.0 92/8 PHOSPHOR BRONZE Light is a standard light gauge phosphor bronze string for acoustic guitars. It has a brilliant and gorgeous tone. The Martin LIFESPAN 2.0 series achieves long life while maintaining the tone of non-coated strings, reduces finger noise, and is a next-generation coated string that provides excellent playability and feel.