Real size ~ 4x4 meters.

Highly detailed seamless textures:
Diffuse, microbump: 8192 * 8192px
Normals,AO, Displacement (EXR 32-bit): 4096 * 4096px
To save RAM, it is possible to reduce the detail by halving the size of images in the photo editor.
In the scene, the sample plane is 12x12 meters. Displacement height ~ 10cm. Used VrayBlendMtl, HardWax SSS, VrayDisplacement, VrayNormal
AmbientOcclusion map is not used.