Introduced in 1990, the '57 Classic provides warm, full tone with a balanced response, packing that classic Gibson Patent Applied For humbucker crunch. They are made to the same specs as the originals, including Alnico 2 magnets, nickel-plated pole pieces, nickel slugs, maple spacers, and vintage-style, two-conductor braided wiring. The '57 Classic humbucker features balanced coils for a smoother, creamier tone and excellent hum cancelation. The pickups are also wax potted to remove all internal air space and any chance of microphonic feedback.