The small wicking holes are either old stock with the bio ceramic cloth or BDC not BVC, these are the only two authentic aspire nautilus heads with the small wicking holes.
When aspire went from the ceramic cloth to cotton they had to enlarge the wicking holes to prevent dry hits / slow / inadequate wicking.
All authentic aspire BVC's are marked BVC on the body.
The large wicking hole are the only ones that use cotton.
Head on left large wicking hole (cotton wicking material)
Head on right small wicking hole ( bio ceramic cloth or counterfeit non aspire unknown wicking material)
There are massive amounts of fake/counterfeit nautilus replacement heads on the market.