Sauna stoves are the primary components of saunas. Even there are different types of sauna stoves depending on the types of heat sources, these stoves also need sauna stones. Stove stones are volcanic stones that do not crack, break down or explode when water is poured down on them by a sauna ladle. Not every stone is a stove stone. Stove stones are resistant to heat changes and they preserve this feature for many years. Sauna must also be resistant to chemical effects as sauna essences will be poured to water. Also it must be resistant to mechanical teraing outs as well. Poolline sauna stove stones are composed of volcanic dolerit rock stones that are resistant to rapid heating and cooling as well.