Children will love these unique textured balls. They are soft and stimulating. They enhance gross motor and tactile skills, and encourage crawling, grasping and coordination. Softly rolling the textured balls on a child's back or feet heightens sensory awareness. Includes Set of 4 - size 4" each. 10cm in diameter. Baby can squeeze, roll, throw, or kick these textured play balls. Ages 6 months and up.