Compatible Francotyp Postalia T1000 / Optimail Red Fluorescent Cassettes (3 Per Box) Replaces OEM Part # 51.0019.5301.00 100% Customer Satisfaction for your T1000 / Optimail Mailing System Made in the USA Replaces OEM part # 51.0019.5301.00 ISO9001 & CE Approved Yield: 2500 impressions