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.Package list1 x Guitar magnetic pickup 2 x Screws 1 x Volume Control knob 1 x Tone Control knob