VERSATILE DECORATION: These giant letter foil balloons are perfect for a variety of celebrations, from birthdays to weddings to graduation parties. PERSONALIZE YOUR PARTY: Spell out a custom greeting or the guest of honor's name to add a special touch to your party decor. EASY TO USE: These giant letter foil balloons are self-sealing, making inflation quick and easy – no helium required! HIGH-QUALITY FINISH: The metallic sheen of these giant letter foil balloons adds a touch of elegance to any event. DURABLE MATERIAL: Made from high-quality aluminum foil, these balloons are not easily punctured or deflated. LIGHTWEIGHT AND PORTABLE: These giant letter foil balloons are lightweight and easy to transport, making them perfect for party planning on the go. REUSABLE: These giant letter foil balloons can be deflated and reused for future events, saving you money and reducing waste. REGARDING INFLATION: Balloons filled with air will not float; only helium-filled balloons will float. Helium is an inert gas that is expensive but very safe. If you don't have helium, you'll need to purchase a hand pump or foot pump. The inflation rate for aluminum film balloons is generally around 70%. Do not over-inflate to avoid balloon damage, affecting use, and wasting the balloon. REGARDING RETURNS AND EXCHANGES: For quality issues, please take photos and confirm with our customer service before returning or exchanging. Generally, the intact rate for a package of balloons is about 98%, and some air leakage is normal. Customers who return or exchange for non-quality problems must bear the shipping cost. Customized products are special and cannot be returned or exchanged. Please be informed.