Our balloons are filled with Helium which is non-toxic, non-flammable and safe for the environment. Our latex balloons are made of 100% biodegradable natural rubber. Please leave the helium in the balloons. It is not meant to be inhaled (ingestion of helium can be harmful and can also be fatal). Adult supervision is suggested for balloons with children under the age of six (6). Do not allow children to put the balloons in their mouths.