I work at a place where customers come in with children of all ages. I keep some of these memory cards in my desk drawer. I often engage the kids who are old enough to read in conversation with questions like......"do you know the ten commandments"......or "do you know the story about"..........and then I show them these cards.......show them how to use them.........let them try them......then send them out with a card to take home. They are so amazed and happy to show them to their parents.....or sometimes a grandparent......they love them.
It's a great way to share "church" with them.