This puzzleball from Ravensburger is designed especially for pre-school kids. Extra large plastic pieces support 3D comprehension and fine motor skills. The 24 piece puzzleball comes with an assembly aide for the little puzzle beginners. 24 curved plastic pieces fit together to form a perfectly smooth surface. No glue required. The finished puzzleball is a "picture-perfect" decoration for every kids room. Colorful and age-appropriate puzzle fun for children from 4 to 6 years. Each puzzle piece is numbered on the back so you can puzzle by the image or by number ? your pick. Approx. 5" round.