Petit Collage beginner puzzles grow with kids. As pre-schoolers master the 3-piece puzzle, they then progress to the 4-piece, 5-piece, and 6-piece puzzles. Four puzzles included in each set. Easy slide box allows for quick clean-up. Dimensions of large-format puzzle pieces: 5.5 cm x 7.5 cm approx. Made with 80% recycled content and printed with vegetable based inks. Conforms with CPSIA and ASTM standards.