Earthwood is the legendary acoustic guitar strings faction of Ernie Ball - the most famous guitar strings brand in the world. These strings are made using the bright, loud, and crisp sounding 80/20 bronze wrap wire over tin-plated steel hex core. They'll feel Slinky and responsive while offering good tension for big chords. Earthwood strings are consistently the acoustic guitar standard. Earthwood is the legendary acoustic guitar strings faction of Ernie Ball - the most famous guitar strings brand in the world. These strings are made using the bright, loud, and crisp sounding 80/20 bronze wrap wire over tin-plated steel hex core. They'll feel Slinky and responsive while offering good tension for big chords. Earthwood strings are consistently the acoustic guitar standard.