Are you asking about the oud instrument's bone material? If so, some ouds have bone components, such as the nut and saddle, which can affect the sound and playability of the instrument.

Bone is a popular material for these components because it is hard and dense, which helps to transfer vibrations from the strings to the soundboard.
This can result in a more sustained and resonant sound. Additionally, bone components can also help to improve the intonation and action of the oud, making it easier to play. However, it's worth noting that some people prefer alternative materials for these components, such as synthetic materials or ivory substitutes, for ethical or personal reasons.

Ultimately, the choice of materials for your oud's bone components is a matter of personal preference and what sounds and feels best to you.