Vintage Remington metal rings (to hold the ink ribbon). They are not made anymore. The ink ribbon is fresh ink ribbon, spooled by hand onto the metal spools.
Will fit
Remington DeLuxe
Remington Travel Riter
Remington 5
Remington Quiet Riter
and many more...
The metal rings are sealed so that the ink lasts 12+ months if not used immediately.