Willow Sync フランジセット24mm（2個入り）

These fit securely and the 24mm size is much more comfortable than the 28mm ones I tried before. I’ve been using them for a few weeks and notice a real difference in output.

Been pumping daily for six weeks now and these still hold up without any warping, though I wish the pack came with more than two since I rotate them constantly. The 90-day replacement suggestion feels about right, they're starting to feel a bit less snug than when new.