The four major instruments in the string family, the violin, the viola, the cello and the double bass, are built the same way. The instruments are made of many pieces of wood which are glued - never nailed - together. The body of the instrument is hollow, thus becoming a resonating box for the sound. Four strings (sometimes five on the double bass) made of animal gut, nylon, or steel are wrapped around pegs at one end of the instrument and attached to a tailpiece at the other. They are stretched tightly across a bridge to produce their assigned pitches.
The violoncello or cello is the tenor voice in the string family. While shaped like a violin, the cello is much larger and is held between the player’s knees. Because it can produce beautiful sounds from its lowest to its highest notes, it is a popular instrument.