LD Compatible Replacement for Samsung SCX-4521D3 Black Laser Toner Cartridge for use in Samsung SCX-4321, SCX-4521, SCX-4521F, SCX-4521FG, and SCX-4521FR s - Walmart.com
RECARGA │REFILL DE TONER SAMSUNG SCX4521F - YouTube
Samsung SCX-4521D3 Print Cartridge for SCX-4521F, SCX-4321, Approximate yield 3,000 pages, Black (SCX4521D3