DESC: Acoustic Pickup. Made by Martin. The Second Generation Martin Thinline 332 acoustic pickup is manufactured for Martin exclusively by Fishman Transducers. This is Martin's most popular pickup with tens of thousands sold worldwide. Six piezo crystals under the saddle produce clear, dependable acoustic sound. Features include • Authentic acoustic sound • Works with any preamp • Easy to install • No change to the body of the guitar • Can be fit to most models • Virtually eliminates feedback • Stereo switching jack for optional stereo wiring