K&K Definity System Gold, Compression Pickup, Especially suited for “wedged” applications under a floating bridge, Designed to work well with almost all instruments with a floating bridge, for example: archtop guitars, Macaferri guitars, semi-acoustic guitars with tune-o-matic bridges, Is also well-suited for use with banjos, cellos, and many other ethnic and traditional instruments like the bouzouki, saz, etc., Incl. Definity preamp