Bouncing on a Gymnic Hop 55 promotes balance and coordination in children while providing a fun workout. The Hop 55 Ships uninflated so parents can adjust the level of inflation according to the size and age of the child; includes 1 valve and 1 Plug. Patented handgrip ensures safe bouncing; inflated ball measures 22" in diameter and has a maximum sustainable weight of 160 pounds. Made from soft, super-strong, latex-free bands, BPA-free and phthalate-free vinyl for years of worry-free enjoyment. Suitable for children ages 7 and up. Hopping promotes balance and coordination in children while providing a fun workout. Hop ball features a special patented handgrip safety handle for the safest hopping. Warning! In case of puncture the ball bursts. Please make sure that the ball is used on a surface free from pointed objects.