Happy Birthday Fireworks 18 Inch Mylar Balloon (5 Pack)

1 Package of 5 mylar/foil round balloons Approx. 17-18" (43-46) Self-sealing & Refillable Manufactured with Durafloat inside balloon...making it last 3-5 times longer! These balloons will sink to the ground when they are cold, making them appear to be deflated. Once they renter a warm environment, they will inflate themselves as the air warms and expands. Use colors to match birthday themes, making it a perfect balloon for bouquets or attaching to any gift.