Ernie Ball Earthwood phosphor bronze medium-light strings provide you with a balanced tone and comfortable playability for your acoustic guitar. Featuring gauges 12 to 54, these strings produce warm, full bass notes, clear trebles and a balanced midrange. The phosphor bronze wrap wire is engineered to stand up to the rigors of acoustic playing while maintaining intonation and tone. You'll find fast, fluid fingering across the fingerboard thanks to the medium-light gauge. When you're ready to record or perform, you can rely on the fresh, rich sound of these strings to convey the full sonic range of your guitar.