This set includes a heater bag and stones, allowing you to easily experience hot stone therapy. Place the stones in the heater bag and plug it into a power source. The stones inside the heater bag will accumulate heat. The stones (basalt) are made from volcanic lava. They excel at retaining heat and are recognized for numerous effects, including far-infrared effects, healing effects, and the natural geothermal energy effect, to name a few. Because of this, they have been treasured as mystical stones by Native Americans and have been passed down to the present day. Heater bag set Width 17cm x Height 22cm (internal heater bag) Hot stones: 10 pieces, 4cm x 3cm x 0.5cm Bodywork Massage Aroma oil Healing power 7