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1.Full set. Ready to be filled with your own ink.Compatible cartridges with chip. No more prying chip from old cartridges, Integrated filter to prevent clogging printhead. 2.Compatible with: Pro WF-3820 WF-4820 WF-4830 WF-7310 WF-7830 WF-7835 WF-7840 3.The cartridge is transparent. It is easy to view how much ink left to prevent from lack of ink to cause air bubbles or how much ink filled in to avoid overfill for easy operation. There are easy-refill hole and rubber plug on the top of each cartridge. It is very easy to remove the plug for ink refill and replace it back after. 4.The cartridges have auto-reset chips. When a cartridge is empty, just remove, refill, and when you put it back in, the ink level will read full. 5.Save hundreds of dollars. Just buy ink from now on. Compatible with dye, pigment, edible or sublimation inks.