From China. Basalt. 7.5 x 5 x 2.2 cm. The pure energy of the earth's interior. Through vibration and heat, lava stones, sometimes also called hot stones, affect the energy pathways in the body. Massage with lava stones harmonizes the vegetative nervous system, activates blood circulation, the joints are relaxed due to increased blood flow, and subsequently the whole body is cleansed. Metabolism also stabilizes.