4 x Toner Chip for Ricoh Aficio MP C3001, MP C3501 (841578 ~ 841421) Refill
Amazon.com: Ricoh 841578 for Black Toner Cartridge MP C3001, MP C3501 : Office Products
Ricoh 841578 High-Yield Black Toner Cartridge for use with Aficio MP C3001 and MP C3501 Printers; Up to 22500 standard page yield @ 5% coverage; New Genuine Original OEM Ricoh Brand, UPC 708562009324 (84-1578 841-578 8415-78)