Let me start by saying, these flange inserts are a lifesaver for anyone struggling with standard 24mm flanges. As someone who's used the Momcozy M5, I can vouch that these 16mm inserts fit like a dream - no more awkward gaps or uncomfortable tugging!

The soft food-grade silicone feels gentle against sensitive skin (no more redness!), and they maintain suction perfectly. I've noticed a significant difference in output since switching - gone are the days of getting just dribbles!

What surprised me most was the versatility. While I bought them for my Momcozy, they've worked flawlessly when I borrowed my sister's Medela too. The package coming with two means you always have a clean one ready - crucial for those 3AM pumping sessions.

My only wish? That they included a measuring guide. Figuring out your exact size can be tricky for first-time moms. But once you nail the sizing (pro tip: measure after pumping when nipples are at their largest), these make pumping so much more comfortable you'll wonder how you managed without them.

After two months of daily use (and frequent sterilizing), they're holding up great with no signs of wear. At this price point, being able to replace them regularly is totally doable. If you're on the fence about sizing down from standard flanges - take it from someone who tripled their output - these are worth every penny.