Dimensions (Overall): 6.75 inches (H) x 3.38 inches (W) x 5.38 inches (D)
Weight: .32 pounds
Package Quantity: 2
Compatible With: Ameda: Purely Yours
Item Number (DPCI): 030-05-2362
Flange size - and your fit - is determined by the width of the flange opening. You can measure your nipple to estimate which size flange is best, then check your flange fit by watching your nipple during pumping. A good fit can help make breast pumping comfortable and help you pump more milk. These flanges and inserts replace the standard size flange that comes with all Ameda HygieniKit Milk Collection System to ensure you find your best fit. This item includes two (2) 30.5mm breast flanges and two (2) 28.5mm reducing inserts that fit inside the 30.5mm flanges.
I extensively researched sizing before ordering. For Ameda, the standard size is small and the next size up is M/L. The large is a normal style flange, just bigger than the standard size, while the medium is actually an insert into the large that reduces it in size. I need the medium, so use the insert; the down side is that it is more washing (but you can always use the cheat of keeping the flanges chilled in between pumping sessions, if you cannot wash them on the go), but the upside to the inserts is that you can try out two different sizes and also adjust if your body changes over time.