Bare Knuckle Humbucker The Mule Neck Nickel Classic 'Patent Applied For' vintage tone with exceptionally balanced frequency response and more than enough power for almost any application. The Mule humbuckers are built and voiced as faithful reproductions of the best sounding late '59 PAFs with a differing number of turns of vintage correct 42 AWG plain enamel wire on each coil. Outstanding clarity and extended dynamic range. Solid nickel silver baseplate and cover. Even at low levels of gain, smooth harmonic feedback, full of overtones is possible, while clean sounds have depth and unmistakable vintage character.