Jumbo Size: AULE offers 40 inch 0-9 jumbo gold number balloons. This package includes gold number 21 foil balloons and an inflatable straw for easy inflation and deflation. Exquisite Design: Once filled, the balloon self-seals—no tying needed. Simply pinch the air inlet to secure the built-in adhesive. Durable Material: Made of safe, non-toxic, and durable foil. Inflate to 90% capacity for full expansion (over-inflation may cause bursting). Floats perfectly when filled with helium. DIY Party Essentials: Our giant gold 0-9 mylar number balloons are perfect for birthday, anniversary, graduation, New Year celebration, and other special events. Customer Service: For any questions about the product, please contact us via Amazon's messaging system. We value your feedback and will use it to improve our products. Jumbo Size: AULE offers 40 inch 0-9 jumbo gold number balloons. This package includes gold number 21 foil balloons and an inflatable straw for easy inflation and deflation.