 
           
           
           
          Please note:
Montessori materials are NOT toys, but educational materials. Proper use requires appropriate training.
Montessori materials may contain small, rough, sharp, or other elements that could cause injury or damage if used improperly.
It may therefore only be used by children under the supervision of appropriately trained persons and in an appropriate environment.
The child learns the size change in two dimensions. The material consists of ten wooden prisms, each 20 cm long. The height and width of the prisms vary by 1 cm (from 1 cm to 10 cm). The child is offered word lessons on the formation of terms such as: thick - thin, thick - thicker - thickest, thin - thinner - thinnest.