The original Gorilla Spiky Ball now comes with a squeaker!. Gorilla Spiky Balls are made from super-strong TPR. Because TPR is so resilient, even if punctured the toy it will still retain its shape. Gorilla balls are bouncy, and dogs love the texture that the spikes provide. Gorilla Spiky Balls come in assorted colors: red and purple. The XL size is great for medium to extra large sized dogs