Page Yield:Dell 21 Black ink tank contains 35ml, Color ink tank contains 18ml, up to 30% more pages than OEM, low cost for per page.Technology:1.Print Head Cleaning Technology: protects the printer from being destroyed and polluted.2.Print Head Testing Machine Technology: adopts Germany chip testing machine, let the cartridge is 100% compatible with printers.3.Eco Friendly Technology: good flexibility, rejects environmental pollution.4.Zero-energy Technology: ensures that your professional quality documents remain crisp and smudge free. Prints resist fading for quality that lasts.
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