Check the listing for details. Blackhawk 80/20 Guitar Strings Acoustic Bronze, 11-52 Light Guitar Strings Ac.... Condition: New. Listed at 21.31 USD. Blackhawk 80/20 Guitar Strings Acoustic Bronze, 11-52 Light Guitar Strings Acoustic 6 String Set, Sparking Tone with Warm Rich Sound, Micro-Thin Coated Acoustic Guitar Strings, Made in the USA. Our acoustic guitar strings 6 string set consists of 80% copper and 20% zinc wrapped with a nickel plated steel wire core, making it durable and break-resistant for peak performance.