Stone size: Crushed raw stones approximately 1.5-3.5 cm Tono Stone - Natural Stone Natural stone only found in Tono, Iwate Prefecture Adding it to your bath will warm you from the core of your body. You can reuse it by washing it about twice a month and drying it in the sun. Contents: 3kg (may vary slightly) * Stones only will be shipped; the bag containing the stones is not included. This item has been stored indoors for a while. * Instructions are not included. Please understand and purchase accordingly.