Melissa and Doug Self-Correcting Number Puzzles

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 at the same time. Dimensions: 5.75" x 13.75" x 3" Assembled Recommended Ages: 4+ years