NEW Montessori Constructive Triangles - 5 Boxes Constructive Triangles Set of 5 Boxes 5 wooden boxes containing different kinds of triangles. These are standard size Montessori Constructive Triangles Constructive triangles gives the child an opportunity to experience plane geometry by manipulating /forming triangles. As well as allowing the child to perfect visual discrimination of size, shape, and colour. Product Weight: 6-7 lb