SP, Studio/Performance, series strings are made by Martin Strings craftspeople from an ultra-high quality steel core that resists breaking much better than average strings. Both the core and the plain strings are plated with a smooth acoustic bronze finish. They stay bright, have long lasting tonal qualities, and look absolutely beautiful on a guitar.

MPN: 41MSP-4100

- Bronze alloy for brilliance and long life
- Studio-quality performance
- Gauges: 12-16-25w-32w-42w-54w