The ball is made of a rubber core of a basketball and common felt of tennis ball， it's much thicker than a normally pet tennis ball. Please fill the ball as harder as possible when you receive the product.Genuine 9.5'' / 24cm Tennis Ball， Super thick!Use for signature or pet toy (My dog loves this type tennis ball very very much).Color：As picturePackage include：1 Pc X 9.5'' giant tennis ball