SAFE & REUSABLE: Number Balloons are Made from Safe, Non-Toxic, High Quality Food Grade Material. The Number Balloons are Reusable, SELF SEALING: The balloons are self-sealing, so no tying is required, HELIUM/AIR: The balloons can be filled with both helium and Air, PERFECT DECORATIONS: Number Balloons are the perfect Decoration Addition to your Birthday, Anniversary etc.,