The 57J1 L/S is the Fender American Standard Jazz Bass® ( J Bass® ) replacement pickup set with a ‘long’ for the bridge and a ‘short’ for the neck. The set is highly respected by musicians and luthiers alike for its deep tone, strong lows, low mids tone. They feature a Dual-Inline hum-cancelling coil design. The “original series” bass pickups with passive designs. They are cast in epoxy to remove unwanted feedback and microphonics.