Celebrate your child s birthday with these fun and colorful Spiderman and Batman Marvel Airwalker Balloons. The medium-sized balloons measure 22x25 inches and can be easily inflated using a hand pump or straw. With a self-seal valve these balloons are perfect for decorating the party venue and creating an exciting superhero-themed atmosphere. Suitable for boys and toddlers these high-quality balloons from the Kidsfavor brand are a must-have for any Marvel fan s birthday celebration.