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Disciplined development, innovative production, and outstanding service have positioned Porelon as the leading manufacturer of specialty inks, gels, and microporous foams used in marking and identification products for the past 30 years. The Porelon PR78 Calculator Ink Rolls replace manufactures part #'s CP-17B/R, CP-20, IR78T, and EA-781R. They provide vivid and consistent black and red color in addition to exceptional light fastness and durable impressions. This product has been designed and manufactured to operate the original equipment identified, and will not void your equipment warranty. The PR78 Calculator Ink Rolls come in one of each color - black and red. Through constant product improvement, Porelon is committed to providing their customers with a wide variety of quality products at an exceptional value.