- D'Addario EXL120: These are John Mayer's signature strings for electric guitar. They are made from nickel-plated steel and have a medium gauge (10-46).
- Ernie Ball 2223: John Mayer has also been known to use Ernie Ball 2223 strings, which are made from stainless steel and have a medium-heavy gauge (11-49).
Acoustic Guitar Strings:
- D'Addario EJ16: John Mayer uses D'Addario EJ16 strings for his acoustic guitar. These strings are made from phosphor bronze and have a medium gauge (13-56).
- Martin M140: John Mayer has also been known to use Martin M140 strings, which are also made from phosphor bronze and have a medium gauge (13-56).
It's worth noting that John Mayer may use different strings depending on the specific guitar he is playing and the sound he is trying to achieve.