This is a set of 4 board books. Because they are made of thick paper, they are not easily crumpled, and were easy to use when my baby was small. "Onabe-san" and "Densha Gatagoto" are interactive books. They have been read frequently, so there is some wear and some folds, but I think they are still usable, so I am offering them for sale. Please understand that these are used items that have been used by a child before purchasing. - Titles: The Very Hungry Caterpillar Jaa Jaa Biribiri Onabe-san Densha Gatagoto