A number balloon collection features balloons shaped like numerals, often used for celebrations like birthdays, anniversaries, and other milestones. These balloons come in a variety of colors, sizes, and materials, with popular choices being metallic finishes like gold, silver, and rose gold. They can be filled with helium to float or air for easier handling and can be used individually or combined to create larger numbers, such as "30" or "100." Often seen at parties, events, or as part of photo backdrops, these balloons add a festive and personalized touch to any occasion.