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According to what Annie Pan answered on another thread, the second airflow insert is 3mm... should be 2*3mm, because the one you see on the pictures has two airflow holes.
2*2.5mm
So have you tried them out yet?
So far I've only tried the 2*3mm insert SKU 9727481 that I also ordered. Which feels slightly airier than a single 4mm id airflow hole. This is the only dvarw version I've tried before, but it has extremely smooth and quiet airflow.