Ernie Ball Earthwood 80/20 bronze extra light acoustic guitar strings provide a warm, balanced tone for your acoustic instrument. Constructed with 80-percent copper and 20-percent zinc, these strings produce crisp highs, ringing mids and rich lows that accentuate the natural qualities of your guitar. The hex-shaped steel core adds clarity and definition to each note. Whether you're fingerpicking or strumming, these extra light strings have the flexibility and sensitivity to convey the nuances of your playing style.