I ordered some Post for my PGM (stripped other pair) and I got my bearings and o-rings out. In my bearing (de shielded), on the edge I found this
It is clear small and round. It sticks to a pin and flings up when the need puts pressure on it. Could this be Dried lube? There where a few other small ones in the bearing.
It’s a YYF Hubstack A bearing.