Cat Toy - Spinning Top

My cat spent the first 20 minutes straight playing with this simple toy, then it got lost under my couch. It's best if used on a hardwood floor, like in the kitchen. You can spin it like a top (except horizontally) and the cat will immediately swat at it. The cat will then try to catch it, but it will keep rolling away. The toy has a large center so it will wobble when the cat hits it causing it to move in a direction that's not easily predicted (contrary to a ball). This also gives it some extr