These go between the brake pads after removing the wheels from the bike.
Maybe I’ve just been lucky, but I do not remove my rotors when flying. With the Speed Hound bag, the wheels have their own padded compartment and I face the rotors toward the inside of the bag so I feel there isn’t much chance for damage unless the event is catastrophic.
Also, be aware, when using soft sided bike bags, airlines will not reimburse for damage. They only will if using a hard sided bag.
If I could figure out how to post a picture, I would.