Master Massage 9 pcs Standard Marble Stone Set

Q: What Is It made out of?

Dear Customer， Thank you for your inquiry. The Master Massage 9 Pieces Cold Stone is made by natural white marble rocks as the only materials. If any further question please feel free to let us know. Have a nice day.

Q: How do you heat the stones??

I don't own a crock pot so I put a towel in a pan of water put the stones on the towel and then heat the water. A crock pot would probably be better if you have one.