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CPTACLP4721B 3.5K page
CPTACLP4721C 2.8K page
CPTACLP4721M 2.8K page
CPTACLP4721Y 2.8K page
TRIUMPH ADLER(Toner Cartridge)® CLP 4721/P C2160DN
the same as KYOCERA MITA TK-582, the difference is chips/gears