Barcus Berry B3150 String Bass Piezo Transducer and Pre-Amplifier Clamps easily to bass bridge and removes easily. No drilling or tools needed. This transducer is a favorite for its ability to capture the full musical range of the upright bass - delicate tones to deep lows. Includes the 3000A preamp. Preferred by bassist Terry Hale (George Strait). Pickup/Transducer clamp-style piezo bass transducer. Preamp 3000A piezo buffer preamp with EQ. Attachable belt clip with one set of dual lock attachment strips. Velcro strap. Black metal strap mounting bracket with one set of adhesives.