Narvi Traditional Sauna Stones, 5-10 cmNarvi traditional sauna stones (20 kg). Traditional olivine diabase sauna stones are very durable and produce great steam. These stones are suitable for all sauna heaters. The 510 cm sauna stones are recommended for electrical sauna heaters. Sauna stones are packed in 20 kg boxes. Stones in the range of 5 to 10 cm are suitable for wall mounted heaters with a low power output. $70 price only applies to the purchase of rocks with low output electric