American Ninja Warrior Bounce Ball Race Set B4 Adventure $34.99 Default Title - $34.99 Quantity This product is currently sold out. Looking for challenging action that's big fun? Inflate 2 big (24") high-impact, anti-burst balls, then stake the start and finish lines. Racers grab the handle and go–to the finish line! For warriors up to 250 lb. Ages 5 - 12 years