hard plastic shell with soft cover not impressed [SEP] nope gave to different dogs and neither liked it first it s not a ball it s a hard plastic round shell that has a battery placement inside of it on the outside of this is a very flimsy on off switch that works like a ball point pen it turns off when the ball rolls over it there are extra covers for the ball which is nice it rolls pretty well for a few minutes but then just stops the dogs i gave it to did not care for it maybe it s better for a cat i don t recommend this especially for super chewers