looks like a mushroom.. haven't seen these much around for sale  http://i.imgur.com/D06vwT9.jpg   It feels like a medium size silicone tip, but with the length of a biflange. 

Does anyone use a small flat type case for their IEMs? I was thinking of using a thicker cigarette tin/case. I need something that would fit in my pocket and most of the soft circular cases are kind of big, and will flatten in pockets.   Edit:~ Found some... Pelican 0945 Pelican 0910...