(Product Description) The certification ball is still difficult to handle, but you want to use a real ball. A middle ball with a diameter of 6.7 inches (17 cm) recommended for children and child. The long-awaited middle size of the Aurora Ball This product is not certified as a product. No certification mark. The color of the actual product may differ slightly from the color shown on your screen. Product specifications are subject to change without prior notice. Thank you for your understanding. Ball net not included. Initial air pressure is low, so please adjust it yourself. Size: Diameter 6.7 inches (17 cm); Material: Rubber standard service life: 1 year manufacturer's recommended retail price is based on the manufacturer's website.