Easily demonstrate number relationships on the whiteboard! colorful, magnetic circles, squares, and counters are designed to demonstrate fact family and part-part-whole relationships for the entire class. Great way to build addition and subtraction skills. This comprehensive set includes 3 Circle and 3 square number bonds (8″ and 9½” in diameter, respectively), 4 connecting lines, and 45 magnetic counters measuring 1¼” each. Note : The back of the retail packaging shows the square shapes. The product includes 3 sheets of magnets where the circles, squares, connector lines, and the counters are perforated where the user would pop them out to use. For ages 5 and above.