Adamas Strings for Acoustic Guitar Historic Reissue Phosphor Bronze Round Core - 12-str. Light .010-.047 (1616RC)The legendary Adamas Phosphor Bronze strings now available as Round Core version Slowly wound high end strings Round instead of hexagonal core wire The wrapping lies flat on the core wire, giving a longer sustain and more balanced and harmonious sound. The same wire thocknesses and lower string tension gives a comfortable playing feeling Roundcore strings must not be shortened before tightening, otherwise the wrapping is loosened and the string is