General characteristics of the coins:
-made of composite materials
-semitransparent
-have a firm, smooth surface
-do not bend, keep their shape
-emit a specific bone sound when tapped

Security features of the coins:
-contour and direct microtexts
-fiber, glowing blue when exposed to UV radiation
-graphics, glowing when exposed to UV radiation
-colorless elements, glowing when exposed to UV radiation
-elements that have a selective absorption in the infrared range