Black Toner Cartridge Compatible with Samsung SCX-4521F (V6720)
Samsung SCX-4521D3 Original Black Toner Cartridge - Printerinks.com
SPS 4521 / SCX4521 Black Toner Cartridge for Use in Samsung SCX-4521, SCX-4321F, SCX-4521F, SCX-4321 Single Color Toner (Black) : Amazon.in: Computers & Accessories