DescriptionThey are perfect for people often using computers and mobile phones. These stones have great heat retention, perfect for spa and massage therapy. Wide applications, suitable for feet, face, eyes, back, arms and foot. A nice, easy and convenient way to enjoy massage. Natural energy stones contain trace elements needed by human body.Features- Color: Black. - Material: Stone. - Size: 3.70X2.80X0.60cm/1.45X1.10X0.24 inch. - Selected material, which can be safely and durably used for a long time. - Each stone goes through a proprietary treatment process to give you clean, smooth and fully-usable stones. - Just the right smoothness for a perfect glide. They will take care of your skin in their process of massage. - Suitable for those who long to use computers, mobile phones or other electromagnetic radiation class equipment. - Natural energy stones contain trace elements needed by human body.