The Cleartone Acoustic guitar strings are a revolution in guitar strings. They are the world’s first physically tuned Acoustic strings that emphasize specific natural elements of natural guitar acoustics. They are the ideal guitar strings to get the maximum sound from your guitar. The low E string from the Cleartone’s is made to have a pure copper surface that will provide you with a wonderfully warm, low-end sound. The A and D strings are made from purest phosphor bronze that will create a richer mid-range tone. Finally, the G string which has an 80/20 mix of both will produce some bright tone that will make guitar notes overall sound cleaner and brighter. Additionally, all six strings come with our twice patented Cleartone treatment for Extra Longevity, Increased Volume, and Longer Sustain.