Shadow SH 951 Single Side Upright Bass Bridge Pickup The Shadow Single Side Upright Bass Bridge Pickup is not only a legend for Rockabilly bass players. Upright bass players from all around the world have appreciated and trusted this pickup for decades. A single bass pickup with 2 sensors, it has 2 opposing sensors to accurately reproduce the sound of the string and body vibrations. Sensors mount between the wing and feet of the bridge. Features a 1/4" female socket for instrument cable.