The Konica Minolta Toner TN-321 Black (A33K150 / TN-321K) is a genuine OEM black toner cartridge designed for use in high-performance Konica Minolta bizhub color printers such as the C224, C224e, C284, C284e, C364, and C364e. Engineered to provide crisp, professional-quality black output, this cartridge supports an estimated yield of approximately 27,000 pages at 5% coverage.