VOLKA ROCK DIFFUSER We source only the finest quality volcanic rocks, . The rocks are produced due to intense heat and pressure, which creates molten lava. When cooled, the rocks become extremely porous and are perfect for allowing the slow release of our specially formulated essential oils. Each fragrance has been specially formulated with an artistic pallet that will transport your senses. Volka Rock Diffusers are safe and free of all carcinogens that will create a fresh and welcoming environment. Our product is pet and child friendly and there is no need to plug-in or light it, so it can be left unattended safely in your home.