For use in Ricoh, Lanier, Savin MP C3003, MP C3004, MP C3004ex, MP C3504, MP C3504ex Compatible with RICOH, Savin, Lanier part numbers: 841813, 841817, MP C3503 for black Toner kit contains 1 Black cartridge PAGE YIELD: 29,500 pages/black, tested with the ISO/IEC 19798 industry standard of 5% page coverage