Package contents: 16 packs of 37 water balloons, a total of 592 water balloons with 3 adapters, random colors. Self-sealing without knots. No more hassle of filling and tying water balloons. There's nothing more exciting than a water fight on a hot summer day. Quick-fill water pump: with connection adapter for fast filling. Fits different faucets. With these quick-fill water balloons, it's very easy and fast to make water bombs, fill 111 water balloons in 1 minute. Auto-sealing design: when the balloon is sprayed with a certain amount of water, the water balloons automatically tie and drop, so you can conveniently store ammunition for your water battles. It's best to place water-filled water balloons in a bucket of water to make them last longer and not break on the ground. Environmentally friendly material: the water balloons are made of 100% biodegradable high-quality natural latex and can be stored for a long time. Color mix. Environmentally friendly, non-toxic, tasteless, chemical-free, safe for children. Perfect summer toy: It's safe and perfect for kids and adults. Perfect for all kinds of parties, water battles, bathroom parties, summer water games, and more. With this set, you'll have even more fun at summer pool parties, picnics, and events.