Match these wooden puzzle pairs to make mastering numbers as easy as 1, 2, 3. Groups of objects illustrate numbers 1-20, and the puzzles are self-correcting--each piece has only one match that fits--so children can play independently and learn all the while. # Pieces In Set: 40 Power Source: Battery (not Included) Measurements: 12.75 Length/Inches, 5.75 Height/Inches, 2.75 Width/Inches Base Material: 100% Wood Country of Origin: Imported