Martin & Co. M200 Folk Guitar 12 Strings Xl 3 Packs Extra Light String Gauge: .0115/.0115, .014/.014, .023/.010, .028/.014, .038/.018, .047/.028 Martin Folk offers the driving force of steel strings and soft tonal properties often associated with classical strings.? A center wrap of silk fiber provides easier fingering and minimizes the brilliance for a sweeter and more mellow sound. For the Marquis we hand wrap silk around the ball end area to reduce wear on the bridge plate.