Available formats are .max .fbx .obj .3ds .stl .dae all are available inside the .7z file.
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No textures, only materials with names.(3 materials)
There are 9 meshes available:
By scaling the meshes you can obtain more variety of rocks.
The models do not have UCX collision.
Contact me for more formats, i might help you with it.
The models have been tested in Unreal Engine.