Perfect for playing with the Rainbow for marble games. The high contrast in color, as well as textured surfaces of the monochrome series of toys, help to develop individual needs. Children with visual handicaps will be motivated to discover the world around them by discerning a more visible world. These multi-sensory toys with simple forms, high contrast coloring, and textured surfaces or motion driven sounds will aid in the development and stimulation of particular senses. 6 Wooden Balls in black and white. Materials: made of maple wood, non-toxic water-based color stain. Size: diameter = 4,5cm.