The Rickenbacker 4001 is a bass guitar model introduced in the early 1960s, known for its distinctive shape and bright sound. It features a solid body, typically made of maple, and is equipped with two single-coil pickups that contribute to its unique tonal characteristics. The 4001 is favored by many musicians for its versatility across various music genres. This model gained popularity among rock and pop artists, notably used by Paul McCartney of The Beatles and Chris Squire of Yes. Its design includes a narrow neck and a unique triangular inlay, making it visually striking as well as functional for bass players.