Single piezo Pickup for Upright Bass. A favorite among Rockabilly players, the Shadow SH 951 Single Side Upright Bass Pickup features one pickup with two opposing sensors that produce unparalleled, deep bass sound when the strings are either plucked or bowed. The sensors mount between the wings and the feet of the bridge. Single pickup with two opposing sensors. Sensors Mount Between the Wings and Feet of the Bridge. Includes 1/4'' Output Jack. No drilling necessary to install.