PTE12 is the mirror magnetic marble square tile expansion pack. Each tile features magnets along their edges, making it easy to snap them together. No limitations, scalable to build as large as desired by adding more tiles to create a masterpiece. Each piece of magnetic tiles is manufactured with high-quality, toxic-free, BPA-free materials with the highest standards to ensure the safety of the children. For children ages 3+. PicassoTiles Mirror Magnetic Building Tile Blocks, Construction Sensory Gifts Magnets Expansion Square Set, Toddler Magnets, Educational Toys for 3+ Year Old, Kindergarten Toys, Stacking Blocks | Picassotiles | | PICASSO-TILES 12 PC Mirror, Magnetic Tiles, Building Blocks, STEM Toys for Kids 3+ Set | Best Buy