They all use different ones. Most professionals are sponsored by different Bowling ball compaines, so they all get to pick wich type of ball they would like to use. They do have a few things in common though. They all have reactive cores, and they all weigh about the same, between 12 to 16 pounds.
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Pros almost always use a 16 pound bowling ball. In rare cases, when a pro has an injury to their wrist or arm/shoulder, they will use a 15 pound ball.
The best pros are all sponsored by one of the bowling-ball companies. Because all balls are different as are all bowling centers, the best pros own one of every ball their manufacturer sells.