TROY 601/602/603 MICR Toner Secure 02-81350-001 yield 10,000 Part Number: 02-81350-001 Coordinating Non-MICR HP Part Number: HP-CE390A Cartridge yields approx. 10,000 pages with 5% coverage TROY Security Toner was created as a way to help prevent fraudulent alteration of documents The patented security agent forces a bright red stain to permeate through the document if chemical alteration is attempted