Gibson 57 Classic Plus Zebra, 2-conductor, Potted, Alnico II, 8.1k ohmsSince their introduction in the late 1950s, Gibson's famous Patent Applied For humbuckers have been considered the ultimate pickup because of their smooth, velvety tone. The '57 Classic Plus uses slightly overwound balanced coils, exactly like the originals of the late 1950s that accidentally received a few additional turns of wire. They are the perfect bridge position companion to the '57 Classic, delivering just a little more of "the sweet stuff"