The 2nd Generation Martin Thinline 332 acoustic pickup is manufactured for Martin exclusively by Fishman. 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 Endpin Jack included 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.