Risograph S-4202 Value Pack Genuine Black Duplicator Ink Sold by the Case and the Case contains 10 Tubes of Genuine Risograph Ink for use in the Risograph FR2950,FR3910, FR3950, RP3100, RP3105, RP3500, RP3505, RP3590 Digital Duplicators. Each Case yields approximately 50,000 prints at average coverage of 6%.