My Lexmark printer needs these specific ink cartridges. So, I have been buying them for over a year or two now. I used to like this brand of inks. But, over the last few months though, their quality may have deteriorated. The last couple of black ink cartridge from the 36 and 37 combo that I used either had dried ink in it or something. The cartridge lasted me fewer pages than the earlier ones used to last. Actually, this same thing had happened to with the HP 98 inks as well. That was the reason whcy I had moved to Lexmark in the first place. But, I have to acknowledge that I am less frustrated with my Lexmark than than I was with my HP, though that is not saying much about Lexmark. My thought is that ink manufacturers like Lexmark and HP need to reduce prices of their inks and improve the quality.