Sauna Heater Stones HARVIA Black Vulcanite 5-10cm 20kgSauna Vulcanite Heater Stones PRODUCT DESCRIPTION VULCANITE HARVIA SAUNA STONES 5 10 cm 20kg Plagioclase (primary geological component) sauna stones are selected according to old traditions and convey a genuine sauna atmosphere and heat. Stones in the range of 50 to 100 mm are suitable for wall mounted and on the floor heaters. These sauna stones provide good and soft heat. The sauna stones are essential for a good sauna experience and good humidity