Made using tough polypropylene plastic
...These refills contain a gas mixture that is 100% safe for people animals & the environment. Most of us are familiar with its pleasant lemony scent. Citronella is an essential oil that is derived from the stem & leaves of lemon grass & has been used in medicine for a thousand years. The propellant gas is the ozone friendly R134a. Used in many medical inhalation products it is harmless to pets & people.