Description: Magnetic effect magnet configuration Soundhole Magnetic Pickup for 39''/40''/41''/42'' Acoustic Folk Classical guitar With the effect of active pickup changing to passive pickup, also can produce the effect of playing board beat Magnetic transducer captures vibrations quickly 6.35mm female converter converts mechanical vibrations to an electrical signal Provide excellent string-to-string balance while the pickup's active electronics and low-noise No need for drilling hole, easy to install, adjust tone and volume as you like Material: Rosewood Size Chart: Pickup size: Approx. 102 x 28 x 28mm / 4.01 x 1.10 x 1.10inch Package Includes: 1 Set Guitar Pickup 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