3 - 6 years. This set provides progressive challenges for children as they gain early math skills. Each number labeled piece only connects to the board with the matching number of holes. Use these colorful self-correcting number puzzles alone or combine with pegs for counting and matching. This puzzle promotes fine motor skills, number recognition, and problem-solving skills. Includes 55 pegs in 5 colors, 10 rubber number boards, and a durable plastic storage tub.