Himalayan Massage Stones are hand-made using simple carving techniques out of the purest Himalayan Salt Rocks. *REMOVE PLASTIC BEFORE HEATING* Heat: Massage Stones can be warmed up in a Microwave for about 30 seconds. Himalayan Salt can hold heat for over an hour. Can also be warmed up on a skillet. Set heat on LOW. Do not Heat excessively or injury may occur. Should be warm enough to hold in your hands. The best way to heat a massage stone is by using one of our Warming Bowls. The bowl is made from Himalayan Salt with a 40-Watt bulb that warms massage stones perfectly and also can be used as a decoration lamp. Search for part # HSSL-MSW. USE: Simply grab a massage stone after it has been warmed up and roll/rub over parts of the neck or shoulders. This could be done while watching TV or reading a book and you will slowly notice the ease of tense muscles. For foot pain- keep two balls or stones on the floor and roll/ hold with your feet. Helps relax feet for those who don't have time for a foot soak. For Back- after the Himalayan Massage stones have warmed up, have a partner add a few drops of massage oil and roll over back. Himalayan salt also exfoliates the skin leaving it smooth while helping release tense muscle pain.