FITS FOR: The pickup is suitable for many kinds of acoustic instruments, such as guitar, ukulele, mandolin, banjo, etc. GOOD SOUND: It is to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects. So it can transmit good sound quality. STICK PATCH DESIGN: With 3 stick patch transducers, it is very easy to install and you can onto the instrument to minimize the damage to instrument body. NICE AUDIO JACK:The audio jack can replace pin and install the strap. Condition: Weight: . 144g Installation 1. Remove the tail nails and widen the tail holes to the appropriate width (about 1-1.5cm in diameter) (without tail nails, find the right position to open the hole) 2. Stick the patch to the position that is most acceptable for vibration, usually 3. Attach a fixing pad to the appropriate position and fix the long connecting wire to the fixing pad with a fixing strip. colour:black Material:Metal + ABS size:Cable Length: . 60cm / 23.6in Jack Size: 6.35mm Pickup Diameter: . 3cm / 1.2in Package Contents: 4 x Pickup Piezo 4 x Cable Tie 4 x Block