This specific 3D model, "Engine Skull Auto Wings Ride Ring 3D print model purchase", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 331 MB), OBJ (OBJ, filesize: 164 MB), 3DM (Rhinoceros 3D, filesize: 265 MB), ZTL (Zbrush, filesize: 12.6 MB), FBX (Autodesk FBX, filesize: 32.1 MB)