OK, i wanted to know also. Went to surevapes to find out. They are referring to the ring around the carto that must be needed for a specific tank. Well, in this case the Boge F16 tank and can also be used for SmokTech DCT tanks. I believe, but could be wrong, that you don't even need this ring carto for most carto tanks. In any case, i hope that answers your ?
And no you don't need the drip tip. I started out not using one, but i prefer one now. Just to let you know- I ve used 6 of these Boges so far and 1 was bad from the start. Good Luck
Thanks for the research...as long as it's not something I'll need to get to use them out of the box as regular cartos that's good. I'll definitely be hitting up surevape on my next paycheck as that's the cheapest I've seen them..less than $1.00 ea!