This specific 3D model, "Gas mask helmet 3d model military combat fantasy Low-poly 3D model 11", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
This specific 3D model is provided under the "Unknown license" framework.
MA (Autodesk Maya, filesize: 238 KB), OBJ (OBJ, filesize: 209 KB), FBX (Autodesk FBX, filesize: 624 KB)