Magformers Basic Solid Clear Rainbow (40 Piece) Set Magnetic    Building      Blocks, Educational  Magnetic    Tiles Kit , Magnetic    Construction  STEM Toy Set Larger set with solid squares and triangles in green and yellow colors. Play is magical and fun. Neodymium Rare-Earth Magnets for guaranteed connectivity. ABS plastic magnets conform to CE, ASTM, and EN92 Compatible with all Magformers shapes and accessories.