Volka Rocks are produced in the UK, hand blended and hand poured with the highest level of purity. The packaging is environmentally friendly and recyclable. The volcanic rocks are sourced in Iceland. As lava rock is extremely porous, they are ideal for the slow release of the specially formulated essential oil. Volka Rock Diffusers are safe and free of all carcinogens and will create a fresh and welcoming environment. The product is pet and child friendly and as there is no need to plug it in meaning that it can be left unattended safely in the home.