80/20 Bronze wire wrapped onto a hex core. Have you ever wished your acoustic guitar could ring a little more, maybe be a little brighter? If this is the case than our San Diego Acoustic 80/20 Bronze Strings maybe just what the doctor ordered. The same tension and feel as with our Portland sets but with an all together different EQ curve. They'll brighten up even the darkest guitar. Compare our Quality and Price to anyone else's, we win every time!