These are the cards that children can manipulate in order to master the concept they are learning. In this case, the child is learning to read phonetic three letter (CVC) words. They include a card with an image and the word label, a card of just the picture and a card with just the word label.
The images are sized 4x6. There are 10 cards in each set. Each set is grouped by the vowels: a, i, e, o, u. You will have five sets of Three Part Cards.