These Ernie Ball Earthwood 80/20 Bronze Alloy Rock and Blues Acoustic Guitar Strings are manufactured in the USA to the highest standards. With a gauge of 10-52 these Earthwood strings provide bright and balanced tones with crisp and pleasing highs. These popular acoustic guitar strings are ideal for guitarists who enjoy a bright sparkling sound with excellent intonation and who specialise in rock and blues styles. These 80/20 strings are precision wound from 80 copper and 20 zinc and they come as a 6 string set.