Made from 100% natural rubber, Sophie la Girafe's 3 Musical Balls stimulate baby's sense of hearing with their 3 distinct sounds. Gently squeezing the green ball produces a soft sound of crumpled paper. Shaking the white ball results in a bell tinkling. Momentarily pressing on the yellow ball produces Sophie's unique "poet" sound. This aids the baby in developing their auditory sense, as well as building an understanding of cause and effect.