Birth & up. Bolli Balls are a great sensory development tool for babies and children. Open ball design is soft and pliable, perfect for stretching, grasping, teething, shape exploration, fine motor skills, and hand-eye coordination. Made from 100% nontoxic, BPA and phthalate free, food grade silicone. Dishwasher and freezer safe. Colors may vary. Set of 3.