These Balloons Are Made of Premium Latex, Each Ballon is Weight to 2.8 Gram, Extra Thicken to Make Sure These Balloons Wont Leak. These 12 Inch Balloons Are Perfect for Parties, Anniversaries, Grand Openings, Product Launches, & All Types of Events. These Bright Color Balloons Can be Filled with Air or Helium, & It Could Floating in the Air 5 to 8 Hours When Inflated with Helium. We Have 5 Inch, 8 Inch, 10 Inch, 12 Inch, 18 Inch, 24 Inch & 36 Inch Balloons, Various of Colors Are Available.