With the FA19, FiiO presents new flagship earphones that feature a total of ten BA drivers per ear to achieve an enormously detailed sound. The transparent, 3D-printed housing allows a view of the drivers.https://www.notebookcheck.net/Transparent-in-ears-with-10-BA-drivers-and-Hi-Fi-mode-FiiO-unveils-FA19-flagship-IEMs.833509.0.html
This is gonna be a hot take, but most in ears monitors are transparent lol