The X55CBJS-T1 is an X5 shape soapbar pickup for the bridge position. The single coil design features deep tone, strong lows, low mids, low noise.
The "Classic Bass" series bass pickups are passive designs featuring an extended and more resonant frequency range. They have far more "air" and definition at the top without sacrificing lows and low mids. They are cast in epoxy to remove unwanted feedback and microphonics.