Barcus Berry DISQIS Soundboard Transducer for Internal Mount Ideal for virtually all types and sizes of acoustic stringed instruments equipped with a soundboard, such as steel stringed guitars and dulcimers. Furnished with Barcus Berry exclusive Fas-Jac 1/4-Inch strap button mono jack or 1/4-Inch external mount output jack. Easy to install and provides high sound levels with no feedback. Ideal for classical steel stringed guitar, dulcimer, guitarron.