Innovative magnetic self-sealing design that quickly fills and seals. Easy to open with slightly bump or pinch, suitable for summer, beach, swimming pool, pool party and outdoor water fight. Easy and Fast Play- Open, fills and seals in the water pools all only takes a few seconds then you can throw it directly. Does not need a faucet. Just Enjoy the happy summer time. Best Gift- Water Fight Ball are the perfect gift for kids. A fun way to keep kids cool and active during the hot days of summer. Just let children enjoy more outdoor sports, play less video games.