The model is made with zbursh, no UV and no Tex., multi-subtools, partial subtools retain subdivision level， low subdivision level wiring you can see screenshot.partial subtools isn‘’t Solid closed model，such as pages and rivets， also you can see screenshot. The model are merged and Decimationed separately (see screenshots for details) and exported to obj formats the output size19.63*11.73*24.76cm，also provide maya, blender versionYou can get more information from the preview pic.If any question please write to me.