• Sound-themed party supplies: includes 1 happy birthday banner and 6 aluminum balloons. • High-quality materials: degradable aluminum film balloons, safe and odorless. • Birthday party decorations: balloons popular among children. • Wide use: perfect for birthday parties, games, baby showers, and more. • Easy to use: fill with air or helium and secure with ribbons. • For your children's birthday for a fun and vibrant celebration. • Very suitable for your sonic birthday party decoration. • Fill the balloon with helium or air, do not overinflate. • Use an air pump to inflate the balloons. • New items may have a latex or plastic smell, ventilate before use. • Children should use it under adult supervision. • Since it is measured manually, there may be slight differences in size.