Nadex Typewriter Ribbon Twin Spool for Vintage Manual Typewriters, Red/BlackRibbon on a 2 inch spool with a 5mm central aperture. Two color ribbon, red black allows you to switch between red and black ink. Reversing grommet ensures a seamless typing experience. Compatible with most Royal, Olympia, Smith Corona, Remington, Olympia, Brother, and more portable and standard vintage typewriters. Introduce a burst of color to your timeless creations with our two tone ribbon, allowing you to seamlessly switch between classic black