“RobertB” and ” atbglenn ” yes you are right, Just edited my earlier comment after reading the full description on the website. They add the button top and put on a clear wrapper on a flat top, so they are probably fine. The number of vents on these are irrelevant since they are stated as modified flat tops with their own button tops added. Still not sure about the internal resistance. You may want to edit your post as well, since I screwed up by not reading the description. Sorry about that, My Bad….