You will enjoyrr lava shell relaxation massager r lava shells are the world39s first self heating massage tool a unique innovation in warming spa therapies that induce deep relaxation whilst easing muscle and joint aches and pains offering the benefits of a hot stone massage but with an added bonus of being eco friendly the lava shell relaxation massage therapy uses 100 genuine recycled tiger clam shells which heat up internally for up to an hour with a combination of natural minerals