"Metal, plastic, and canvas-looking fabric clips. They are a few inches long and some say FLATEX'"
A: "They look a bit like the things attached to a garter belt to hold up stockings…"
For you younger guys. Dating was much more fun before pantyhose.
It is used to keep the pistons from the disk brake caliper separated when the wheel is removed in case the brake lever is pushed accidentally.
It's from Adafruit, the company famous for their DD8008S and attempted takeover of Apple... so everything else is obvious.