Froebel Toys 5 includes 21pcs cube, 6 half-cubes, and 12 quarter-cubes. New terms like angle, triangle, diagonal, rectangular prism can be introduced. Fractions and other mathematical concepts can be discovered and concepts of geometric shapes, size/shape differentiation, parts-of-the-whole relationships, and others can be further explored. With this Gift, children can see it as three cubed (33), the larger 3" cube composed of 27 1-inch cubes (albeit some further divided into triangles). For older children, the Gift may also be positioned to represent more abstract mathematical concepts such as the Pythagorean Theorem (A2+B2=C2). 

Use high quality beech wood box for storage it. Smooth varnished, water base painting, Eco for all kids.

The Froebel Gifts are good educational toys for kindergarten. they certainly were the first materials designed for child development, as Kindergarten was the original preschool method. Also can sell the inner parts separately or do OEM order.