Thanks for the info. Interesting . . .
Theses look just like the MicroBrushTM applicators I have been using for years. Originally those were designed for dental work. On MicroBrushes the handle color indicates head's size. I usually use white, yellow, and green. I don't recall seeing blue. I wonder if these are just MicroBrush fakes? Do they have fuzzy (like static grass) heads, or are they actual sponges?