Hornblende, Small Grains Stone size: Approximately 0.5 to 1.5 cm, crushed raw stone. 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. * Because they are small grains, please put them in a very fine mesh net. * Be careful not to let the stones come out of the net. * Be careful not to scratch the bathtub. You can reuse them by washing them about twice a month and drying them in the sun. Other various uses. Contents: 1.5kg (Slightly variable) * Stones only will be shipped (Non-woven fabric, glass, etc. are not included). These have been stored indoors for a while. * Instructions are not included. Please purchase if you understand the above.