Marco Pavanello has kindly released some FREE Blender PBR Materials. The Materials also come with a well written up guide on how to use and implement into your designs. This new 1.1 version adds the materials – Wood, Leather, Cloth, Ceramic, Marble, Fire, Microfiber, Transparent as well as some improvements and bug fixes on his previous release.
*Check the source link below for more information.
Source: Wolf Flow