Gymnic activity ball is great sensory stimulation and visual therapy. Inside this clear, 19.69" Gymnic ball are a multitude of small, colored balls that fly around when it's rolled or bounced. Not recommended for children under 3 years of age. Features: -Gymnic activity ball. -Color: Clear. -Great sensory stimulation and visual therapy. -Constructed of PVC. -Adult supervision. -Diameter: 19.69". -Overall Dimension: 1" H x 9" W x 22" D.