1、MUSCLE MASSAGE: Heat therapy massage stones can be used to reduce muscle tension and pain. It helps to promote blood flow and also reduces muscle spasms. 2、MATERIAL: This hot stone massager is made of smooth, round black basalt with a high silica and iron content and can maintain a temperature of 25 to 35 minutes. 3、APPLICABLE SCENES: These heated massage stones can be used in spa salons or massage stores, or at home. Easy to operate, safe and comfortable. 4、WATERLESS HEATING: Our massage stones can be heated quickly without water, which is easy to operate and faster heating time, only 10 minutes to heat up. 5、IDEAL CHOICE: Can be used with essential oil massage to reduce stress, muscle tension, soreness and stiffness, it is also ideal for athletes, home care and spas. A variety of sizes are available for use with massage on all body parts. Item Type: Massage Stones Material: Basalt, wood Characteristics: no wax, no oil, original Energy Stone Size: Approx. 4pcs: 8 x 8cm / 3.1 x 3.1in 4pcs: 8 x 6cm / 3.1 x 2.4in 8pcs: 3 x 4cm / 1.2 x 1.6in Applicable People: 1. People who face computer, TV and drive for a long time. 2. People who Easy to shoulder and neck, back pain, mental tension, stressful. 3. People who long term insomnia, neurasthenia, headaches, dizziness, hair lost and memory loss. 4. People with insufficient blood supply to the brain, lack of oxygen and shoulder and neck discomfort. 5. People with chronic constipation, diarrhea, and gastrointestinal discomfort. 6. People with poor blood flow, irregular periods and menstrual pain. 4 x Energy Stone 3.1 x 3.1in 4 x Energy Stone 3.1 x 2.4in 8 x Energy Stone 1.2 x 1.6in 1 x Aluminum Box