Basalt rock is originally found deep within a volcano where it remains for hundreds of millions of years, gaining all of its natural properties. All Basalt is rich with iron and magnesium, which make this stone very effective in massage treatments. Basalt is excellent for holding heat for long periods of time and has very low radiation which makes this rock a much more healthy and beneficial stone for use. This, 28 pcs Mini Full Body Massage Stone Set is ideal for a full body hot stone massage. After heating the stones up to 55 ℃ (130°F), enwrap the stones with natural essential oils, and apply them onto your client's skin. It's suitable for a 45 minutes hot stone massage. This set is suitable for a full body massage including the head, face, neck, backside, arm, leg and feet. It will maximize your treatments and make your clients feel extremely comfortable.