Stone size: Raw crushed stones approximately 1.5 to 4.0 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. * Please use it in a thick net or similar to prevent scratches on the bathtub. You can reuse it by washing it about twice a month and drying it in the sun. Contents: 5kg (Slightly varies) * 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. We appreciate your understanding and purchase.