Ernie Ball Earthwood Silk and Steel Soft 80/20 Bronze acoustic guitar strings are made with an 80/20 bronze alloy wrap, along with a layer of silk between the wrap and steel core. The silk produces a more mellow sound and makes the string feel more comfortable while reducing finger noise. Gauges .011, .015, .022w, .030, .042, .052. Features: Made with an 80/20 bronze alloy wrap with a layer of silk between the wrap and steel core Silk helps produce a more mellow sound Makes the string feel more comfortable while reducing finger noise