The Shadow SH SB1 is a single disc bass transducer. Sensors mount between the wings and feet of the bridge. Includes an attached 1/4" (6.3mm) output socket.1 slice transducer (20 mm diameter) with 1/4" (6.3mm) output socket and mounting adhesive Copper foil tape Cable holder 1 slice transducer (20 mm diameter) with 1/4" (6.3mm) output socket and mounting adhesive Copper foil tape Cable holder