This is a set of 2 Substance Alchemist made SBSAR materials available for use in a number of programs like Substance Painter, Unreal, Marmoset Toolbag and Unity.
These materials we're made with photoscans so they dont have the usual substance options, but you can scale the resolution from 4096x4096 down to whatever you need.
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Check here for more images and video: https://www.artstation.com/artwork/lxD68G