Cobalt flats are mentioned in this club often. Now I can finally give my 2¢ (but haven't mounted them yet).
First thing I did - thanks to you guys and gals - was note that they're a little smoother than TIJF (but it's close so you might have to use a fingernail). Pleased.
Second, I noticed that they're a little more flexible than TIJFs. Surprised.
Then, I noticed that they are
round core! Big surprise! (I wasn't thinking about the hex/round issue when I ordered them.)
Now suddenly optimistic that they might be an alternative to either TIJF or TIJR.