"Package of Two" Smith Corona Mark 100, Mark 200, Mark 225, Mark 290 and Others Typewriter Ribbon, Correctable, Compatible

Without any photos, I'm guessing yours is an electronic word processor and not a manual typewriter, which usually means it's a plastic cartridge with carbon tape and not actually ribbon. Google indicates options like: https://www.officecrave.com/smith-corona-printer-ribbons/mark-200/ https://www.amazon.com/Package-Corona-Typewriter-Correctable-Compatible/dp/B00E4ZYB3E Surely there are others if you want to price shop.