OOTSR 4Pcs happy birthday truck shaped aluminum foil mylar balloons add even more sparkle and funny to your party decorations. This construction truck balloons bulldozer dump truck balloons jumbo are durable, not easy to break and can last long, you can fill it with air or helium. They are opaque and long-lasting balloons filled with air can last up to a month, while with helium they can last up to 24 hours. But be sure to keep away from fire sources when filling with hydrogen to prevent explosions. Specification: Size: bulldozer dump truck balloons 21.6*26 Inch(55*65cm) construction truck balloons 31*26 Inch(79*66cm) Quantity: 2 pcs construction truck balloons 2 pcs bulldozer dump truck balloons Suitable for construction truck theme party decoration with truck balloons. The cute construction truck look makes it a great accessory for you to prepare various themed parties. Hanging on the high stool at home, they are gorgeous and give kids a happy and memorable party experience. Tips: Stop inflating the balloon if the 2 layers of aluminum foil are stuck together. Keep balloons away from sharp objects, dirty floors, direct sunlight and heavy objects. If you receive a balloon that is defective or damaged, please contact us directly. We will give you the most sincere customer service. Measured by hand, please allow slight size error.