TROY 4250/4350 MICR Toner Secure High Yield Cartridge 02-81136-001 yield 20,000 Part Number: 02-81136-001 Coordinating Non-MICR HP Part Number: HP-Q5942X Cartridge yields approx. 20,000 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