Constructive Triangle Box includes 6 different  plane figures box:     

Rectangular Box 1, Rectangular Box 2, triangle box, Small Hexagonal Box, Large Hexagonal Box.

By playing this Montessori materials, child can learn:

To show the various plane figures included in the hexagon.
Refinement of the discrimination of geometric shapes.
Development of concentration, order, coordination and independence.
Preparation for geometry.
Development of the appreciation of line and form.