I had used purple index cards that would not go through the printer all the way. We had to take the tonor cartridge out to retrieve them. I had no such problems with these white Staple brand index cards.
A lot of people these days don't use cards to organize their information. I do. As an historian I am compiling a chronological file of information on 3 x 5 cards. The cards are in general hard to find and expensive. Staples gives the best value. Thank you.