GRC Compatible Typewriter Ribbon Replacement for Underwood O.S. Typewriter Spool (Black and Red)

These replacement ribbon cartridges are compatible with a variety of POS, calculator and typewriter products: The housing of each ribbon spool measures 2 inches in diameter, ribbon itself measures 1/2 inch by 24 feet. These universal typewriter ribbons replace manufacturers parts for Adler, Brother, Olivetti, Olympia, Royal, Sears, Silver Reed, Smith Corona and Swintec. This product is interchangeable with the GRC models T17-77 and the T2-77. They produce rich black and red colors and are designed to work with the original equipment manufactured. Use of this product will not void original warranty.