b'EARTHWOOD SILK AND STEEL 80/20 BRONZEEarthwood Silk and Steel Acoustic Strings are made with an 80/20 bronze alloy wrap and a layer of silk between the wrap and steel core. The silk helps produce a more mellow sound and makes the string feel more comfortable while reducing finger noise.TONE PROFILETrebleMidBass9-46 | P02051 10-50 | P02047 11-52 | P02045 13-56 | P02043ALUMINUM BRONZEAluminum Bronze Acoustic Strings feature more projection and clarity than traditional bronze strings, while also providing improved corrosion resistance. Aluminum Bronze Acoustic Strings are made with Ernie Ball maraging steel hex cores and aluminum bronze wrap wire which provide more pronounced lows coupled with crisp brilliant highs. Our patented aluminum bronze alloy is made from a unique blend of copper and aluminum specifically tailored for acoustic guitar strings.TONE PROFILETrebleMidBass10-50 | P02570 11-52 | P02568 12-54 | P02566 13-56 | P0256426 ernieball.com'