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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 pearl houses allow the systematic decomposition of numbers from 1 to 10. The child recognizes, practices and memorizes all combination tasks up to 10. The material takes up the color symbolism of Maria Montessori's colorful pearl sticks and extends the work with the pearl staircases. 
 Red numbers and pearl sticks are not included.