Nowa Szkola Montessori cylinders, sound

Montessori's rich collection of teaching aids includes developmental materials designed to work with children from 2 to 14 years of age.
The products allow children to gain knowledge, competence, skills and experience through their own actions, engaging all the senses. Study materials, including mathematical, botanical and geographical maps, are in classic shapes made from high-quality wood.

Children can pair the cylinders (blue and red) making a sound of the same intensity, or arrange them sequentially according to the degree of intensity of the sound.

It consists of 2 boxes that contain 6 pairs of wooden cylinders, each with different materials.