Fender's F70s 80/20 bronze acoustic guitar strings have a naturally bright tone, that's great for perking up dull sounding guitar. The wrap wire alloy is 80% copper and 20% zinc, which has a bright and sparkling tone. Three gauges to choose from, as listed below. Just use the OPTIONS button to select.
F70 XL .010 .014 .022 .030 .040 .048 inches
F70L .012 .016 .026 .032 .042 .052 inches
F70M .013 .017 .026 .036 .043 .056 inches