Product main files are the game ready files in which the model has been retopologized to roughly 4.8k polygons. The model is UV'd, comes with texture, displacement and normal maps to get you started fast.
There is also 2 printable versions. There is a low toplogy mesh ready for print and a high topology mesh. The high resolution mesh contains an STL and an OBJ of a 156,910 polygonal and optimized mesh. The mesh is solid and not shelled. The default proportions of the high polygonal model are as follows: