After the critical design review, CDR, we can present the design of the free falling units, FFUs, that will fall from space during the experiment. Every unit will have 9 cartridge that contains around 110 g of copper particles. The black lid will be ejected at 5 km and a parachute will deploy.
Here the lower part of the FFU is shown that contains the explosives and the copper particles. Also the spectrograph and the battery can be seen in the picture.