MagVision Toys 104-Piece Magnetic Tile Building Set 104-piece set magnetic building tiles in six bright colors made of high-resistance BPA-free plastic with secure rivets Includes 2 large and 50 small squares; 4 trapezoid, 24 equilateral, 12 right angle, and 12 isosceles triangles Strong magnets that adhere on all edges to support 2D and 3D building Concrete, manipulative toy helps develop mathematical concepts and geometry skills--great learning toy For children 3 and up; meets or exceeds Toy Safety Standards ASTM F963 11