Ages: 2 & Up Pk: 4 PcsStand alone unit is constructed of sturdy durable wood, brightly colored numbers and letters. The paint is water based, non-toxic and kid safe. There is an easy to grip and carry wooden handle so it be brought anywhere. Graphics on one side of the block corresponds to the image on the other side. A great way for children to learn the alphabet. A great learning tool for picture and letter recognition.