ITEM NAME:Universal 6.35mm Pickup Piezo 3 Transducer For Mandolin Guitar Ukulele Mand G6Y2 Universal 6.35mm Pickup Piezo 3 Transducer For Mandolin Guitar Ukulele Mand G6Y2 Color: black Material: Metal,plastic Size: Diameter of cable into the hole 6.35mm cable length 78cm pickup diameter: 3cm Installation is simple,no need to install, use immediately. Pursue to reduce guitar acoustic. A good partner in the showtime. Installation Notes: Open the package, tear double-sided tape,put the microphone pickup to the panel. One side access the pickup, the other side directly inserted instrument speakers. Fit for: Guitar, ukulele, violin, etc. Package Included: 1pc Universal Transducer Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.