Pickup With 3 Transducers Soundboard Compatible With Ukulele Classical GuitarsApplications: 3 IN 1 Transducer Pickup System fit compatible with most string music instruments, amplify an upright bass, banjo, violin, ukulele, viola, cello, mandolin, resonator guitar,etc.Premium: Quality ABS Plastic, Electronic Part: Metal, Color: black lines, silver tone.Size: Small size, portable and easy to use. Cable Length: approx. 57cm/ 22.44inch, 3-pack Piezo electric Disk Dia. : approx. 27mm/ 1.06inch, Endpin Jack Dia. : approx. 6mm / 0.24inch.Self Adhesive: The plastic squares is a self adhesive block to mount the extra wire in your box, without pre amp they will work well.Installation: No Battery and Soldering Required, pre-wired piezo mic save time compatible with you, easy to install, convenient to use.colour: black + silverMaterial: metal+ABSPackage Contents:1 set x pin-free pickupsOnly the above package content, other products are not included.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.