This specific 3D model, "Gas mask helmet 3d model scifi Low-poly Low-poly 3D model 403", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The licensing terms for this digital asset are governed by "Unknown license".
MAX (Autodesk 3ds Max, filesize: 6.35 MB), OBJ (OBJ, filesize: 262 KB), FBX (Autodesk FBX, filesize: 380 KB)