"Composed of" or "made up of" is the phrase used to describe that something is formed or constituted by a certain set of parts or elements.
For example:
The committee is composed of ten members.
This cake is made up of flour, sugar, eggs, and milk.
Source: Engpsh is widely used as a global language in various fields, including science, technology, business, and more, so it is common to use Engpsh to describe things and their composition.