Magna-Tiles 8-Piece Polygons Expansion Set &ndash; The Original, Award-Winning Magnetic Building Tiles &ndash; Creativity and Educational &ndash; STEM Approved The original 3D magnetic building sets that engage young minds by fusing together math, science and creativity 8 translucent, colorful rectangles (4 diamonds, 4 pentagons) Compatible with all original Magna-Tiles building sets Sparks hours of imaginative free play in children. Anything they can dream, they can create! Develops math, science, spatial and tactile skills. STEM approved! Safe, durable and built to last for years Ages 3 years and up