Light gauge string set for acoustic guitars, a combination of bronze wound and straight plain steel. - Brand: HISTORY - Model: AN1253 - Type: Acoustic guitar strings - Gauge: Light gauge .012 - .053 - String Composition: E string: Straight plain steel .012, B string: Straight plain steel .016, G string: Bronze wound .025, D string: Bronze wound .034, A string: Bronze wound .043, E string: Bronze wound .053 Thank you for looking. Although unopened, it is old as it has been stored at home for a long time.