TROY 602/603 MICR Toner Secure High Yield Cartridge 02-81351-001 yield 24,000 Part Number: 02-81351-001 Coordinating Non-MICR HP Part Number: HP-CE390X Cartridge yields approx. 24,000 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