This 5" double-sided Geoboard set features a 5 x 5 grid array on one side and a 12 pin circular arrangement on the other with each piece. Our Geoboards are great for teaching fractions, radius, diameter, circumference and a range of other 2D concepts and shapes. This set of 6 plastic Geoboards in 6 colors also contains 6 packets of multi-colored, multi-sized rubber bands.