I have not seen this product, so cannot be entirely sure, but on many pieces I have seen, the "chrome" is vapour deposited aluminium. The aluminium is applied to a thin sheet of Mylar, or similar film, much like mirror-finish gift wrap. The aluminized film is then thermally bonded to working part, an "iron-on" type of process. The process seals the aluminium between the underlying working part and the application film, so it remains mirror-like for years.
It is possible to buy rolls of such film.