Pyramid Gold Pure Nickel Flat Wound 12-String Electric Light 10-465. The pure nickel flat wire wound strings in this set are paired with silver-plated plain strings to create the ultimate light 12-string set. Light gauge: E - .010, .010 B - .013, .013 G - .010, .019w D - .013, .030 A - .19w, .035 E - .030, .0465