PDLA-G-02 Dimensions: Small: 20-30mm Medium: 45-55mm Large: 60-70mm Extra-large: 100mm x 70mm Total weight: Approximately 500g Set of 4 heart-shaped hot stones The stones are made of basalt (without cracks). Composed of natural basalt, the hot stones are born from the extreme heat of the Earth's magma, then the sudden cooling by sea water. The mineral has been collected and polished by human hands. With infinite smoothness and non-porous, these stones accumulate heat and coolness for truly incredible effects on the body. Hot stone massage then offers a privileged encounter with Earth's energy.