This package contains a .blend file, containing a selection of stylized procedural materials designed for hard surface artwork.
The materials can be used in both the Cycles and EEVEE rendering engines however the use of ambient occlusions means each engine may produce slightly different results.

You can append the materials to your own blend file, or add the downloadable blend file to your own asset library (Edit - Preferences - File Paths) to drag them into your scene from the asset browser.