This is a premium, made in the USA replacement toner cartridge for Samsung SCX-4521D3 guaranteed to perform with Samsung Laser Printers. It replaces the genuine (OEM) Samsung SCX-4521D3 toner cartridge. This toner cartridge is made with top quality components and new toner to give you the highest quality printouts every time. This compatible or remanufactured for Samsung SCX-4521D3 toner cartridge is specially engineered to meet or exceed the highest standards of quality, reliability and page yields. Although this cartridge is not made or endorsed by Samsung, it offers customers an economical alternative to expensive OEM Samsung SCX-4521D3 cartridges and comes with our satisfaction guarantee.