Not as good as the Gorilla brand
I've been buying the Gorilla brand of these balls for years from TK Maxx when they've had them in stock. My dog adores them and the Gorillas survived his strong GSD gnashers well before popping 3 or 4 months into play. I bought these hoping they'd be as strong, but sadly not. All 4 popped within an hour of him having them. Great concept but need to be stronger or a fraction of the price. I also found them to go brittle and thus split at the seams very quickly in the summer sun. Not good if you have a dog who likes to chomp down on his ball.