Large Flo™

One of the best electrode. The long and thin neck gives the head enough clearance for it to stay lodged in there, and the conical base is much more comfortable to sit on compared to that of the flange (which I believe is the same as the moaner's), and neither stay inside on their own so retention of the base is a moot point for these two. The head is round enough to be easy to insert and taking it out. It is small enough to not need much stretch yet large enough to provide adequate surface area. While it isn't perfect, it is the most suited at doing what it does and a definite must-buy in my book.