Middle School 2nd Grade Science Geography 1st & 2nd Grade English Vocabulary & Idioms Vocabulary Card 3-Piece Set They are quite thick. The science cards are not in page order. I think my child separated the cards they memorized and the ones they didn't, but I will send them as is. Please organize them yourself. These were purchased new for my child. Due to the thickness, I will secure the pages with rubber bands to prevent them from scattering, and then pack them.