12 sets of strings made from 92/8 composition alloy to give brilliance, clarity, and longevity of sound.
Here's a 12 pack of MSP4200 Phosphor Bronze Medium Acoustic Strings gauges 13-17-26-35-45-56.
Martin MSP4200 Phosphor Bronze Medium Acoustic Guitar Strings use a winding alloy that is ideally suited for making strings that deliver deep, rich basses and clear, bright trebles.
Martin strings are high-quality strings designed for daily use. Core and wrap wires must meet strict requirements to make the grade. Martin acoustic guitar strings are wound to precise specifications.