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 Lift Off Typewriter Cassette replaces manufactures part #s 21060, 21065, 21560, 21565, 63412, 63420, and 67116. This typewriter cassette provides consistent clear correction by lifting off errors quickly and cleanly in addition to providing 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.