Star Wars Darth Vader Helmet SuperShape Balloon - 25" Foil WARNING:- Not suitable for children under 36 months due to potential small parts that may pose a choking hazard. Adult supervision required. Balloons should be kept at a constant room temperature. Anywhere too warm or too cold could have an adverse effect on your balloons. Discard broken balloons at once. We strongly recommend that you do not inhale helium.