Single disc bass transducer. Sensors mount between the wings and feet of the bridge. Includes an attached 1/4″ (6.3mm) output socket. $ 39.96 Customer Reviews 4 of 4 people found the following review helpful It’s what I expected and does what I need., May 26, 2010 By A. Workman “book fan” (American Fork, Utah United [Description & reviews]