Seymour Duncan TB-4 "JB" model trembucker pickup. Nickel cover. Trembucker spaced for guitars with tremolo bridges or string spacing over 2". The JB model is the high output humbucker that started it all, and is still Duncan's top seller! Lots of power for singing leads and perfect mids. Alnico V magnets rated at 16.4k ohms. Four conductor cable for split/phase options. Includes wiring diagram and mounting hardware. Made in the USA.