"I bought one of these for my lab puppy three years ago. It is still one of his favorite toys.
I put a biscuit treat in and use it as the "treasure" when we play Find-It. I stuff it with kibble and diced Natural Balance Tube Food to keep him busy for a bit in his crate. And when empty, we play fetch with it. It has a great bounce!
By the way, the little lab puppy is now a tough and muscular 115 pound lap dog. And the Everlasting treat ball... it still looks like new."