Seymour Duncan JB Jr. For Strat White Electric Guitar Bridge Pickup SJBJ1BWelcome, you are looking at a great piece. This is the Seymour Duncan JB Jr. For Strat Bridge Pickup. Wiring: 4 Conductor. Magnet: Ceramic. DC Resistance: 15. 2k Ohm. The Seymour Duncan JB Jr. for Strat delivers all the upper midrange harmonics and power to add new life to your Strat bridge pickup. This high output single coil sized humbucker provides crunchy overdrives and screaming lead tones with classic upper midrange cut and a focused low end.