A piece of plastic, 43 mm high, 86 mm in diameter, 31 g in weight - that is the ET-67B. The inside is covered with a kind of suede to avoid reflections on the surface - worked fine! The panel sits relatively firmly, nothing rattles - so it should be. For transportation you can set up the panel reversed, saving space. Pretty would have been, had the Canon Aperture yet donated a bottoming mark. If you, however, the panel assembled a few times, you know what position fits you. In this regard, one can well guided by the type printed on the bezel.
The price - well, bargains are the Canon-diaphragm rarely, in terms of material cost and manufacturing cost of the price is hard to fathom. It seems rather to be that Canon knows what customers pay for genuine accessories are ready.
Last, it should be noted that for the EF-S 60 mm an aperture is already recommended only for mechanical protection of the wide front seat front lens very - hold the function Streulich quite apart.