This propane tank model has 5 separate parts and is a .blend file extension which is the original source file. This model has modifiers in use which includes subsurf. The model is also set to smooth shading. This model is not rigged or textured in any way and only has basic materials. I will leave the texturing up to the purchaser. There are no supporting files. If you need to edit this model in detail and do not have the software. go to blenders website where you can download v2.75A for free.