I bought them from the website above in the first link. The mediums are 11.4mm OD. It took about 3 weeks! I just slept with them for the first time and they did not help my sleep but they are most certainly a huge help during the day. This is day 2 for me at work all day with them. If you looked at my inserts for ENS posts, the first one had an idea for green caps in there with holes drilled. These accomplish that and more. I think what this is also doing is recirculating the moisture as you breathe out thus keeping your nose more moist just like the rubber caps idea. Then there is the corkscrew thing where it changes the flow on the way in. For sleep, and for me, my septum clips still work best. I wish I knew why, but with months of data, they do although these are better during the day and they look better than having a paperclip dangling out of your nose too. People think I have some kind of a nose ring, mostly teens. One gal said it was "cool".

Edited 1 time by parkersmood Jul 11 13 8:49 PM.