• Specifications: 18-inch metallic balloons in gold and silver colors, ideal for balloon arches and various themed parties. • Size and Duration: The optimal size when inflated is 18 inches. They can be filled with air or helium. With air, they last a month; with helium, 24 hours. • Quality and Applications: Durable balloons, 20% thicker than average latex balloons. Reusable for indoor and outdoor decorations such as baby showers, children's rooms, gardens, graduations, and summer parties. • Attention and Warning: There may be a slight color difference after inflating. Do not overinflate and avoid exposure to the sun, overheating, sharp objects, and excessive friction.