https://www.sigerstudio.eu/corona-cinema-4d-landing/

A whole set of Corona | Cinema 4D materials, in a Cinema 4D assets database, that allows easy access and use of material libraries. Choose from hundreds of unique, highest quality bitmap-based and procedural materials to drag and drop into your Cinema 4D scene. All materials offered on SIGER STUDIO come with the relevant texture maps as needed. These materials work only in the Chaos Corona | C4D renderer.