Solejoy's Hot Stone Ball provides a relaxing and comfortable feel to your feet and body by balancing warmth with just the right amount of pressure on your feet. Let's roll the natural stone Karelian soapstone, which was born in Finland 2.8 billion years ago, on the soles of your feet to remove daily stiffness and swelling of your legs. The Karelian soap stone balls in the set can be used not only for the soles of the feet, but also for self-massage of the back and shoulders. In a relaxed moment, sit on a chair or sofa and enjoy the comfort of rolling a hot stone ball on the corkboard of the set. When you want to relax by slowly warming up, or when you want to get rid of swelling in the morning, you can always enjoy a refreshing and cool cooling sensation by standing by in the refrigerator. Apply your own pleasant pressure and relax.　 The cork in the set is made in Portugal and is durable, so you can leave it in your room as an accent in the interior. Feel free to have a roll massage anytime, anywhere, during the kitchen or during the blow out after taking a bath. Please place the ball in the boiling water for a while and use it when it becomes human skin. It can also be used without heating.