Calling all little builders! This Crocodile Creek building block set ensure hours of creative and imaginative play. Includes 9 heavy-duty cardboard blocks. Children can either build the 6 basic structures or use the blocks interchangeable to make hundreds of different structures. Block size: 57mm All Croc Creek puzzles are FSC Certified – this means that the product has been made while still caring for and keeping our forests full of life. square.