I have been using cartomizers exclusively for nearly a year. My preference has been Boge 510s. I figured I'd try the mega version so I recently ordered and received two boxes of 510 Blank Mega Cartomizers (Item #: 510blankmegacart) from Nhaler. The cartos were apparently Boge (by DeKang) by the familiar packaging which was marked as 510D. Even though I've never tried a mega carto before, I expected to see some difference but these are exactly the same size as the regular Boge cartos I have on hand. The first one I tried was defective which is no biggie; I can't hold a vendor at fault for a manufacture's error, but the second held exactly the same amount of liquid as the standard cartos I have on hand. Since I have no experience with mega cartos I admit my questions come from a place of ignorance, but what the heck is the difference? What makes them mega? While the invoice indicates these are mega, is that what I received? Thanks in advance for any insight.