15" in Diameter Durable for indoor and outdoor play Features Trolls Graphics Encourages Exercise Grip and Grab handle Our Hedstrom Hopper balls are one of our most iconic toys in our storied history. These can be used inside or outside, we do recommend staying away from sharp/rough objects, like rocks and sticks. We can't wait to see how much fun your family will have on our Hoppers! This is sure to be your child's favorite hopping toy and get them out and exercising! Whether it is just bouncing around the house or having a hopper race outside, the fun is endless on our Hopper ball!