3 years & up. Chunky, brightly colored squares and triangles quickly and easily fit together to make a wide range of shapes and models. Encourages students to explore geometry and identify the properties of 2-D and 3-D shapes. Magnets are self-correcting, and the colored side (orange, yellow, green, purple or blue) pieces join together, but not with the reverse white side. Includes 36 pieces in 2 shapes and 5 colors; squares measures 4 3/4" x 4 3/4".