Features: 1MUSCLE 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. 2MATERIAL: 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. 3APPLICABLE SCENES: These heated massage stones can be used in spa salons or massage stores, or at home. Easy to operate, safe and comfortable. 4WATERLESS 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. 5IDEAL 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. Package included: 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&nbspAluminum Box