Office King brand cartridges offer outstanding quality results time after time. With the SCX-4521D3/SEE-COM, Black toner cartridge printing is guaranteed to be consistent, bright & clear when you need it the most. Up to 3000 pages at 5% coverage FOR USE IN: Samsung SCX-4321 Samsung SCX-4521 Samsung SCX-4521F Samsung SCX-4521FG Samsung SCX-4521FL Samsung SCX-4521FR