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 Smith Corona H Series Correctable Mylar Typewriter Ribbon replaces manufactures part #s 21000, 21010, 21500, 59436, and 67108. This mylar typewriter ribbon provides vivid and consistent black color in addition to exceptional light fastness and durable impressions. This product has been designed and manufactured to operate the original equipment identified. Through constant product improvement, Porelon is committed to providing their customers with a wide variety of quality products at an exceptional value.