"... These instruments are ideal for young children and toddlers, in as much as regards their robust material, which has been used for their tactile, visual and above all tonal qualities (...) To develop a child's perception of the different types of instruments, it is advantageous to feature differing amounts as well as different types of materials in the shakers. Children will notice how the weight and sound of each instrument varies." (Prof. Marianne Steffen-Wittek)