The Rock Collection comes as a zip file that contains the following:
Rock_1 asset(fbx and obj file format)
Rock_2 Asset(fbx and obj file format)
Rock_3 Asset(fbx and obj format)
4k and 2k PBR Texture maps for each asset( Base color, normal, height and roughness maps)
Rendered images for each rock asset
Wireframe images for each rock asset
OBJ (OBJ, filesize: 382 MB), FBX (Autodesk FBX, filesize: 191 MB), TEXTURES (Textures, filesize: 191 MB)