Elite Montessori Trinomial Cube

Trinomial cubes includes eighteen square based prisms. - 3 red and black, the same height as the blue cube. - 3 red and black, the same height as the yellow cube. - 3 yellow and black, the same height as the red cube. - 3 yellow and black, the same height as the blue cube. - 3 blue and black, the same height as the yellow cube. - 3 blue and black, the same height as the red prism.