20 cartridges for the price of 2 ... it is puzzling. But it works on my MFC J4410 DW. We need to force a little bit to make it fit, but once in place, it works. To be honest, I really have not yet tested the color but the chip is recognized and allows me to finish my old black cartridge unusable because of blocked printer with an empty color cartridge I use very little. For that alone I think it's worth it, especially the cost.