Seymour Duncan Woody Series SC SA-3SC - Single Coil Acoustic Guitar Pickup Tuner Bundle 11500-30 Passive, magnetic soundhole pickup. Comes with True Tune TT-05 tuner! Single Coil design, easy soundhole mount Studio quality cable included (14') Fits all standard soundholes (3.75 (94mm) to 4.0 (100mm) NOTE this is a magnetic pickup, and will not work with nylon stringed instruments