At least I think that's what they are called. I've just bought aquaflex, it's a weighted cone that you place inside your vagina in order to tone up the pelvic floor. As you progress you add more weights inside the cone.
The instructions are a bit confusing, they claim that there's no need to kegel as you wear the cone, however I was under the impression that most ladies tense their pelvic floor as they wear cones or those weighted egg things?