I opened a new package of yellow index cards today. It's by a different manufacturer than the cards I usually buy, which are from Oxford. These cards are smoother than the ones I'm used to writing on. The lines are sharper, too. We'll see. There are 125 in this pack, which is 25% more than the Oxford packs, so I really hope I like them, or I'll be "suffering" for an additional 25% of the duration.
Update: Yep, I might just pitch these cards. They are thinner than previous cards, and smoother in a not-good way. Worse, they are cut slightly smaller than my previous cards, which means they sit oddly in my in-use stack of yellow index cards. Meh.