2 years & up. These 24 sturdy cardboard building blocks are lightweight and strong. Easy to assemble, brightly colored, and easy to stack to make endless building combinations. Includes 3 different size blocks; small bricks (6"L x 3"W x 3"H), medium bricks (6"L x 6"W x 3"H), and the largest bricks (12"L x 6"W x 3"H). Colors include red, blue, and yellow.