OverstockInk 21 Black Ink Cartridges — Compatible with HP 21 / PSC 1401 1402 1403 1406 (5 Black)

High-quality OverstockInk (OSI) 21 replacement black cartridges designed to work with HP 21. This pack contains five black cartridges to replace OEM HP 21 cartridges for everyday printing needs. Printer Compatibility: HP DeskJet 3910 3915 3918 3920 3930 3930v 3938 3940 3940v D1311 D1320 D1330 D1341 D1360 D1368 D1415 D1420 D1430 D1445 D1455 D1460 D1468 D1470 D1520 D1530 D1550 D1555 D1558 D1560 D1568 D2320 D2330 D2345 D2360 D2368 D2400 D2430 D2445 D2460 D2466 D2468 F2110 F2120 F2128 F2140 F2179 F2180 F2185 F2187 F2188 F2200 Series F2210 F2212 F2214 F2220 F2224 F2235 F2238 F2240 F2250 F2275 F2276 F2280 F2288 F2290 F300 F310 F325 F335 F340 F350 F370 F375 F378 F379 F380 F385 F388 F390 F394 F4100 F4135 F4140 F4150 F4172 F4175 F4180 F4185 F4188 F4190 F4194 HP FAX 1250 3180 HP OfficeJet 4310 4315 4315v 4315xi 4350 J3508 J3600 J3606 J3608 J3625 J3635 J3640 J3650 J3680 J5508 J5520 HP PSC 1400 Series 1401 1402 1403 1406 1408 1410 1410v 1410xi 1415 1417 Key specifications: - Page Yield: 190 each black (5% coverage of Letter-sized / A4 paper) - Ink Volume: 5ml each black - Package Contents: 5x OverstockInk 21 black ink cartridges (This is not an OEM product) These remanufactured/replacement cartridges offer an economical alternative to OEM HP 21 cartridges while maintaining compatibility with the listed HP devices.