These Dino Blast Mylar Balloons are perfect for a prehistoric-themed birthday party! Each pack includes one 18″ double-sided, foil balloon featuring a ferocious T-Rex chomping out a “Happy Birthday” message, sure to make any birthday celebration roar. The balloons are made of durable mylar, and are sold in packs of 12, perfect for accessorizing the venue for your event. Coordinate with other Dino Blast Kids Birthday Party Supplies to complete the look! Make your celebration roar with the Dino Blast Mylar Balloons.