The Height, Roughness and Ambient Occlusion maps are pack into one to optimize resources in Game Engines ;)
The material was procedurally generated in Substance Designer & Rendered in Marmoset Toolbag.
https://www.artstation.com/artwork/Dxalmn https://www.artstation.com/artwork/3o6rkD https://www.artstation.com/artwork/k4VO96