6 months & up. Children can bounce, roll, throw and explore using this set of colorful, textured balls. Set includes 2 large balls, 2 medium balls, and 2 small balls in various, nature-inspired colors. Each ball features softened points across their surface intended to create a stimulating tactile experience. Large ball measures 9" in diameter, medium ball measures 5" in diameter, and small ball measures 3" in diameter.