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 2k, 4k sub folders.
Files inside the folders also have proper names.
Maps: 1. Ambient Occlusion - resolution (2048 x 2048, 4096 x 4096)
2. Diffuse - resolution (2048 x 2048, 4096 x 4096)
3. Glossiness - resolution (2048 x 2048, 4096 x 4096)
4. Roughness - resolution (2048 x 2048, 4096 x 4096)
5. Normal(DirectX) - resolution (2048 x 2048, 4096 x 4096)
6. Height(displacement) - resolution (2048 x 2048, 4096 x 4096)
Seamless: Yes, X and Y
Format: PNG
Bit depth: 8 bit