The 22" Red Hop Ball will keep kids hopping to a good time - and great outdoor exercise! This durable 55 cm hopping ball features a strong handle and is constructed of a vinyl, latex-free material that can hold up to any hop marathon! The 55 Red Hop Ball can inflate with bike pump and can be used indoors or on a smooth, safe surface outdoors. And while kids just think they are bouncing around, they won't realize that they are exercising and learning body coordination and balancing techniques. So, when kids are bouncing off the walls with boredom, introduce them to the bouncing fun of the 55 Red Hop Ball!