Material Composition, especially in more primitive settings, typically reflects a single up of a solid material. Connective elements of different material typically hold pieces together (usually better), if it is made of multiple pieces. To be functional, material composition needs to be practical. All crafting and artisanry using skill follows the typical Tradecraft mechanics, which are often governed by Crafts and Trades institutions. These, along with Engineering Practices for large-scale production, govern what is available in a setting.
Impractical: Artistic and ceremonial objects can be made with impractical materials, or materials that may have once been relevant and practical, but compared to modern standards do not rise up. These are typically part of traditions or dramatizations that reference historical and/or symbolic value. Example: Ceremonial or older, less expensive materials may be used for hunting, as opposed to soldiering or policing.