As for the different types of alloys used, bronze gives the strings a bright tone. Phosphor is frequently added to the plating for extra durability and a longer string life. When you see 80/20 bronze, that indicates a wrapping around the core string of 80 percent copper and 20 percent zinc. The zinc gives the string extra hardness makes it more corrosion resistant. Specially coated strings will also protect against damaging debris, sweat and skin oils that can dampen the tone. Silk & Steel wound strings use silk filaments along with silver-plated copper wire over a steel core. This produces a soft, mellow tone for a classical guitar sound. Browse our discount acoustic guitar strings for some amazing bargains on high quality products.