I bought the stones equal to 2 times - once as a gift and again for me. The gift came to super and also I have my pleasure. The stones could, however, stay a little longer warm. But since I do otherwise with such stones have no experience, they still get 4 stars. Only 4 because one of the stones had a plan on arrival. He is not broken, but could thereby possibly break. Nevertheless, I find the stones kept very beautiful and practical in the supplied bag.