Hongway Compatible HP Q3964A Reset Chip Use for HP 2550L 2550Ln 2550n 2820 2840 2830 Drum Unit Chip (Including 10pcs) a Pack Cartridge No: Q3964A Use For HP 2550L 2550Ln 2550n 2820 2840 2830 printer Page Yield: Up to 6K/20K pages (BK) at 5% COVERAGE Package: 10 pcs a pack Delivery Method: ePacket(7-12 days Arrived), FEDEX(2-5 days Arrived)