The reusable water balloons toy is made of silicone, which non-toxic and odor-free. And there is a magnet at the interface to attract it, so that can be reused, which can save our cost and protect enviroment. Backyard battles are more fun than ever with these extremely easy to fill, reusable water bombs, just dunk them into the water to fill up. The bombs then seal shut on their own. Give them a toss, and they immediately splash upon contact. suitable for summer outdoor, parent-child activities, swimming pool, beach, park and so on.