Made of premium chloroprene rubber, these balloons are manufactured to meteorological standards. Small diameter tapered neck for easy inflation. These balloons can be used with pure helium or air/helium mixture (check the telephone directory for your local welding or oxygen supply company for a helium source). Available in six colors (white is not kept in stock but is a special order). We recommend using our 110 ft. economy pennant (#p550) to display your Giant Balloon.