2 years and up. Encourage both physical and social development with classic Playground Balls. These versatile balls will help children develop gross motor skills and hand-eye coordination while also fostering social skills through multiplayer games such as four square and kickball. These multipurpose balls can serve as the foundation for limitless play possibilities. Set of 4 includes one each of the following sizes: 7", 8.5", 10", and 13" balls.