The Seymour Duncan Duncan Custom Trembucker TB-5 is the trembucker (F-spaced) version of the Seymour Duncan Duncan Custom SH-5. The humbucker has a ceramic magnet and are hand built in Santa Barbara CA. The Duncan Custom trembucker uses a small ceramic bar magnet, nickel silver bottom plate, 4-conductor lead wire for multiple wiring options and is vacuum wax potted for squeel free performance.