Porelon Okidata Microline 520/521 Nylon Ribbon with Re-inker, 1 Pack (11514) Replaces manufacturers part number 52107001 Vivid and consistent colors; exceptional light fastness and durable impressions Compatible nylon printer ribbon This product has been designed and manufactured to operate the original equipment identified, and will not void your equipment warranty One year (12 months) from date of purchase