ITEM NAME:Prewired Cigar Box Guitar Piezo Pickup Transducer String Instrument Parts DIY Description: Small and exquisite, gives you the best sound. No soldering required, just drill two hole for & glue on the piezo! Easy to install, convenient to use. Great replacement for other pickups and will give you a surprise. Suitable for cigar box guitar, violin, mandolin, and banjor etc. Material: Copper and plastic Specification: One VOLUME :B500K Size Chart: Piezo diameter: Approx. 29mm/1.14inch Package Includes: 1 Piece Piezo Pickup 1 Piece Volume Knob 3 Pieces Mounting Hardware Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size. SKU: DMO0019405761005336.No soldering required, just drill two hole for & glue on the piezo! 1 Piece Piezo Pickup. Suitable for cigar box guitar, violin, mandolin, and banjor etc. Due to the difference between different monitors, the picture may not reflect the actual color of the item.