These are photography based seamless PBR textures.
Preview images rendered in Marmoset Toolbag.
Each texture have own folder included with preview what belongs to it and 4k sub folder.
Files inside the folders also have proper names.
Maps: 1. Ambient Occlusion - resolution (4096 x 4096)
2. Diffuse - resolution (4096 x 4096)
3. Glossiness - resolution (4096 x 4096)
4. Roughness - resolution (4096 x 4096)
5. Normal(DirectX) - resolution (4096 x 4096)
6. Height(displacement) - resolution (4096 x 4096)
Seamless: Yes, X and Y
Format: PNG
Bit depth: 8 bit