not happy with item
This item does not create enough suction to even stay on the nipple and the rubber rings fall right off (at least on me they do). Rings are too soft (pliable) to stay on nipple. I have used rubber rings before that stayed on until you wanted to take them off; and that was putting them on by hand without any kind of nipple pump. This nipple "erector" is a joke; I've used small plastic bottles that worked better.