This is a new MICR Toner Cartridge for Samsung ML-4050, 4050N, 4551N, 4551ND, 4551NDR printers. It is custom built to replace Samsung ML-D4550B toner cartridges. The MTI © ML-D4550B MICR Cartridge allows you to print professional bank checks from your home or office. MTI © MICR Cartridges deliver high-quality MICR output and excellent toner yield, at an exceptionally low cost per page. Every cartridge is factory-tested and ISO approved, and guaranteed to perform with Samsung Printers. We offer an exclusive 30-day customer satisfaction guarantee and 1-year warranty. Our dedicated customer care staff is available 9 a.m. to 7 p.m, Monday through Saturday, to answer any questions and provide technical support. Please Note: We cannot guarantee the quality of products from sellers other than MICR Toner International.