Barcus Berry 1320 Electric Violin Bridge with Built-in Piezo Pickup Includes 3100P 1/4-Inch output jack. Provides superb acoustic performance together with unequaled acoustic-electric capability. Pickup Transducer select quality unfitted replacement bridge with has a factory installed piezo electric transducer. Output jack BB model 3100P. 1/4-Inch female carpenter output jack with separate U-shaped bottom bracket and 2 turn buckles. Adjustment key. Installation instructions. Preamp not included, not required. Preferred by pro violinists such as Dan Kelly (Alan Jackson), John Jeansonne (Racal Flatts), and Brendon Anthony (The Pat Green Band)