This is a set of plastic or metal wheels and rubber-like tires for detailing car models.
Here's a fantastic set of 15-inch Tom's Rally wheels, with knobby off-road style tires (not evident in the illustration, but they are indeed quite knobby). Wheels are molded in white plastic. Includes two metal screws and four plastic spacers for installation, but some modification may be necessary, depending on the car model you're going to put them on. This is a complete set of four wheels and four tires, enough for one car model.