The RAINBOW BASS.

The rainbow bass is a six string fretless bass. It was the first six string fretless ever made. Les claypool got this particular bass custom made by Carl Tohmpson, making it a Carl Tohmpson bass. Les' collection of basses are mainly Carl Tohmpson's because of they are hand made, high quality and suit Les. Les actually owns two of these basses. It is called the rainbow bass because of the rainbow like pattern on it. WoW!!