Medium strings for acoustic guitar. VintageBronze gives you clarity, tone, and response like no other string. Add a great feel and long life, and there's not much more you could ask for. Made of 85% Copper and 15% Zinc, this true bronze string has been delivering satisfaction to the most demanding acoustic players since its very beginning in 1972. Features set of six strings. String size: .013 / .017 / .026 / .036 / .046 / .056.