Coated heavy cardboard, very durable, very brightly printed. Set comes with characters and structure pieces. Adorable animals and characters are made of soft PVC and are washable. One side of each block has numbers (so it is like a puzzle that fits together). Very colorful with great graphics all around pieces. There is one animal for each box so it can be used for matching. Boxes nest for easy storage back in retail box. For Ages: 18 months +