Experience reliable printing performance every time you print with this OKI black self-inking ribbon.Get long-lasting, high-quality prints for essential documents with this black self-inking ribbon. With a duty cycle of 7.5 million characters, you can print a lot of documents before having to replace it. This OKI black ribbon is individually packaged and compatible with select OKI dot matrix printers and impact printers, and the easy-to-install design offers convenience.