This package contains material samples from Real Materials series - 6 metals, one wood and 9 bonus surfaces - granite/grass/gravel/plaster and so on. Note that this volume is also included in Real Materials Complete pack with much lower price per item.
Number of Unique Materials and Material Instances: two master and 16 instances.
Number of Textures: 85
Texture Resolutions: 80% are in 4K, rest are 1K / 2K or even 8K.
Supported Development Platforms:
Documentation: Real Materials FAQ plus official support thread.