Nu-Kote Bi-Chrome Ribbon for All Spool Ribbon Model Typewriters * Sold as 1 Each * Color(s): Black Ribbon Features: With Cover-Up OEM/Compatible: Compatible Office Machine: Typewriter Printing Type: Singlestrike Material(s): Nylon Quantity : 1 per pack * Compatible with the following Calculator UNDERWOOD: 400Compatible with the following Impact Printer ADLER: 121 DCompatible with the following Ink Jet Printer HP: PORTABLECompatible with the following MED/LAB CLINITEK: 10Compatible with the following Retail Equip. POS/Cash Reg. CASIO: 21Compatible with the following Thermal Transfer Fax Machine HITACHI: 15HITACHI: 45