Unfortunately we do not know when we will be able to get 6MM pots again. Could be a couple weeks or months, no way to know at this time.
However, we firmly prefer and recommend the 4mm pots over the 6mm as we achieve faster performance with 4mm over 6mm and also find the durability to be just as good as 6mm.
But we understand there are opinions out there that push 6mm pots, which is why we offered them. Hope you consider purchasing one of our 4mm pot.