Description This a professional soundhole for 4 String guitar and electric cigar box guitar pickup humbucker. Sound board sensitive, copper coil magnetic pickup. Built-in Class A all discrete preampline driver delivers superb noiseless performance. Highly feedback resistant, quiet and hum free. Adjustable pole pieces for perfect balance and smooth threadless tops. Easy to install and turn in your guitar without any need to solder or worry about wiring schematics. Matched with copper coil, two plastic volume and tone knobs and two mounting screws. Features - Frequency responses: 20Hz- 20KHz- Resister: 5K- Size: 12.3 x 3.2 x 2.5 cm- Sound board sensitive, copper coil magnetic pickup.- Built-in Class A all discrete preampline driver delivers superb noiseless performance. Highly feedback resistant, quiet and hum free.- Adjustable pole pieces for perfect balance and smooth threadless tops.- Easy to install and turn in your guitar without any need to solder or worry about wiring schematics.- Matched with copper coil, two plastic volume and tone knobs and two mounting screws. For 4 String guitar and electric cigar box guitar pickup humbucker.Packing list: 1 x Guitar magnetic pickup2 x Screws1 x Volume Control knob1 x Tone Control knob Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.