Ernie Ball's Earthwood phosphor bronze Rock & Blues acoustic guitar strings provides you with deep, balanced tone and corrosion resistance. The phosphor bronze wrap wire is engineered to deliver rich bass notes, shimmering highs and a clear midrange whether you're fingerpicking or strumming. You'll get strings that intonate well and maintain their tone, feel and intonation longer. The hex core adds more mass to the low strings for a solid bottom end, while the string gauges of 10-13-17-30-42-52 are tailored for rock and blues playing. When you're ready to record or take the stage, you can rely on the freshness and quality of these hermetically sealed strings. This is a 2-pack.