YOFAN foam soccer balls are made of non-toxic high quality foam material, light and soft.Very durable, safe for all pets 1-1/2-Inch diameter, high-visibility colors designed for cat exercise, interactive playing with your kitty. Your kitties will enjoy and even go crazy with bouncing these balls down the stairs or flipping them through the air and chasing them. Even when you get tired, just throw these sponge cat balls and your kittens also can stay entertained with them for a long time.