Martin M130 Folk Guitar Silk & Steel Compound Wound Acoustic Strings are steel strings that are wound with silk on the lower strings, making them softer to the touch and easier to play.
Martin strings are high-quality intended for daily use. Core and wrap wires must meet strict requirements in order to make the grade. Martin guitar strings are wound to precise specifications.
Gauges: .0115, .014, .023, .028, .038, .047.