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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.
Computing frame for visualizing additions and subtractions in number space 20 with a writable blackboard. First write a number on the board and then show the appropriate amount of red and white pearls.
Wooden calculation frame (82 cm) 10 red and 10 white wooden beads (3.5 cm Ø) 
 Wooden whiteboard (35 x 14 cm) 
 2 metal hooks