Heavy duty play toy for all but very small dogs. Made of thick polyethylene plastic. which is food grade not like others that may carry toxins Egg shape makes it very hard to sink teeth into and also makes ball roll irratically. Dog will try to bite or jump on ball but it will just roll away, We recommend giving the dog about half an hours play at a time. Floats so is even more fun in the water. Measures 32cm long, 20cm dia