Hi, I just received a 5 pack of EM-510 2.2 ohm attys, and the first thing I noticed is that they are so much greater in length than the attys that came with my Riva 510 Lite Bundle. I'm sort of wondering what the difference is; actually, I'm sort of wondering why there is a difference at all. Just puzzled, haven't used any of the new ones yet, just stocking up.