Available formats are .max .fbx .obj .3ds .stl .dae all are available inside the .7z file.
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Contains 1 diffuse textures(1024x1024): cracked bone texture(concrete texture tbh)
Some models have been smoothed(nurbs) and some not for variety types of skulls.
There are 11 models available:
The models do not have UCX collision.
Contact me for more formats, i might help you with it.
The models have been tested ONLY in Unreal Engine.
UPDATE 26.04.2020 : Added a second texture for the bones.