The sauna heating stones of high heat capacity and high resistance to temperature fluctuations are a perfect addition to you sauna rooms, providing you with a more convenient and comfortable sauna experience. 15 Kilograms of sauna heating stones are included in a single package. These sauna heating stones can be used in sauna heaters. Size: Approx. 6 ~ 8 cmWeight: 15 kgHigh heat capacityNote: For safety, please follow the sauna heater instruction on how to fill the stones in the container