The NCR Premium Ribbon 151085 is a high-quality calculator ribbon designed for universal compatibility. This ribbon, measuring 1/2 inch x 21 feet, is in a classic black and red color scheme. Manufactured in the United States by NCR, this ribbon is suitable for various calculator models such as the TI-5660 and PR-511. It comes with a manufacturer's warranty, making it a reliable choice for your printing needs. Additionally, it is a compatible type ribbon that is sure to provide clear and precise calculations with each use.