Welcome to Monkey Blocks, the gravity-defying stacking toy that's more fun than a barrel of monkeys! Ready to learn the secret behind these amazing blocks? Hidden weights! Orange blocks are weighted on one end, green blocks are weighted in the middle, and gray blocks have no weight at all. Knowing the location of the weight allows you to stack Monkey Blocks in ways that appear impossible. Amaze your family and friends! Our Idea Booklet illustrates over 30 gravity-defying shapes you can build with Monkey Blocks. Try them, then create your own. Includes 12 blocks, 6 monkeys and idea booklet. Recommended for ages 3-6 years.