This is the award-winning set of building blocks in which all pieces are precision-cut in the exact shape and size, making them ideal for stacking in even proportions. Each piece maintains a precise 1:3:5:15 ratio--meaning 15 stacked pieces equal the height of one on its end, for example, and one piece on its side is as high as a stack of three. The result is that no matter how budding architects choose to arrange their blocks, their walls, floors and roofs always come out level. The 500 pieces of this set require no snapping or gluing to assemble, and are made of lightweight, eco-friendly New Zealand radiata pine. These blocks have earned many top accolades, such as the Oppenheim Toy Portfolio Platinum Award, Goddard Preschool's Top Five Tested Toys and a Dr. Toy 100 Best Products listing. Includes a fabric storage bin. Ages 3 and up. 13" H x 13" W x 10 1/2" L. (19 lbs.)