This is a paid asset, but now you can download Surface Library for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Surface Library v2.1
A pack of photorealistic materials for Unity. These materials were made from real-world photos of the surface and carefully made into materials.
This package currently has 16 materials, however, will grow to a minimum of 50 materials in the future, if supported this package could reach 100+ materials. When more materials are added this package’s price will grow, so buy while it is cheap! The final price will be $1 for every 3 materials.
Old assets in the pack are 2k and contain A,N,S channels. However, all new additions to the library include 4k A,AO,S,H channels.
Feedback is always appreciated!
FAQ 1. How do I know the quality of these materials?
1a. Check out the screenshots!:
2. Can I use these assets in commercial projects?
2a. Of course, you bought it!
3. Can I use these textures and materials in HDRP or LWRP?
3.a I don’t directly support it, however, you can use the material upgrade tool (in the Render Pipelines) to upgrade the materials