Our Christmas string balloons contain nylon aluminum foil. This set of balloons, made of nylon aluminum foil, is puncture-resistant and maintains its perfect shape for a long time after inflation. It's also leak-resistant and suitable for both indoor and outdoor use. The classic Christmas design adds a touch of festive cheer to your home or party. Instructions are simple: place the beveled edge on the front, where you can see the shape. Fold and conceal the nozzle with tape to create a more beautiful balloon. Lay the balloon flat on the ground, open it, and locate the nozzle. Make sure to insert the air cylinder under the colored foil. Gently press the cylinder until it finds the restraint, and inflation is complete. This ensures optimal air retention. The thick material also provides a self-sealing seal, preventing leaks. It will last a long time and can be used as a decorative item.