It would all depend upon the particular inert trainer. Sometimes real mines are used and are just missing the explosive components. In the most extreme examples of inert materials, even the plastic used to make the dummy mine is colored blue, and the only moving part is the rotational arm/safe portion in the middle of the top. To complicate the matter, different nations have their own little differences. The real ones in the U.S. are usually a flat green, lighter in color than the one you show, and not shiny like yours.