SPEED Compatible Ink Cartridge Replacement for Dell 21  (Black, Yellow, Magenta, Cyan, 4-Pack) Dell 21 Black ink tank contains 19ml, Color ink tank contains 30ml. Compatible Printers: DELL V313/V313W/P513W/ V515/515W/ P713/V715W. Print Effectiveness: Make printing smoother, natural looking images and fewer granularities, producing best looking prints ever. Inks stop to come out automatically when printing is over. Technology: SPEED ink cartridges are adopted the leading Print Head Cleaning Technology, Print Head Testing Machine Technology, Eco Friendly Technology, Zero-energy Technology. The cartridges underwent an extensive process including, cleaning, testing the chip, ink vacuum refilling, totally pass to 27 production lines. All cartridges reach the standard when they are tested in any severe environment. Warranty: CE, TUV, ROHS, ISO9001, ISO4001 International Quality Certified.