A 6-pack of high-quality, long-lasting strings Made from 80% copper, 20% zinc wire wrapped around hex-shaped, tin-plated, steel core wire. Among the most popular acoustic guitar strings from Ernie Ball, they provide a crisp, ringing sound with pleasing overtones.All Ernie Ball strings are precision manufactured to the highest standards and most exacting specs to assure consistency, optimum performance, and long life.Gauges 12-16-24w-32-44-54......