I am so thrilled to have finally found the perfect size for me. I went through a bunch of reviews and had a hard time deciding on my perfect size because most people didn’t mention their measurements. So hopefully this helps someone.PRE-PUMP I measure 15mm and POST PUMP I measure 17-18mm with 32I size breasts (but that doesn’t really matter)I have personally tried 15mm, 18mm, 19mm and 21mm flanges. 17mm finally worked out to be the perfect fit for me.I might order another pair of these to have on hand in between washing because I prefer them over my other flanges.
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