The box can hold 10 replaceable filters for DJI MA2. The hinge pin (axis) is made of 1.75 filaments into the holes.
The upper and lower part is held by 4 pcs of neodym magnets 19x9x1.7mm. The magnets are glued with instant glue. Before gluing, it is necessary to check the polarity so that the magnets pull together = the box is kept closed.
The letters at the top box a separate object.