Sauna Stone is a ceramic sauna stone that originated in Finland and is used to perform "Roulu". By making the material porous, the thermal shock resistance is dramatically improved, and the water absorption makes the steam mild, so you can enjoy a clean and comfortable roulu. [SPEC] ・ Material: Ceramic ・ Capacity: Approx. 11.5 kg / box (37 pieces) Approx. 310 g / piece ・ Dimensions: W70 × D70 × H41mm ・ Made of Japan [Mildly evolved steam leads to fine and soft rouryu] This is a fireside original sauna stone developed to make roulu comfortable. By making the ceramics of the material porous, the thermal shock resistance has been dramatically improved. Water absorption, which is one of the characteristics of porous, makes steam mild. By evaporating while absorbing moisture, it leads to a fine and soft roulu.　【Made in JAPAN with excellent thermal shock resistance】Sauna stones heated by a stove are subjected to a large thermal shock by pouring water on them and evaporating them instantaneously. Sauna stones, which are natural stones, may gradually become brittle and crumble due to repeated thermal shocks. Fireside's sauna stone is made of clay with two types of cordialites, which are used in industrial refractory ceramics, to dramatically improve thermal shock resistance, and a unique molding method has been used to achieve stable and high-quality products. Produced in Japan using 100% naturally-derived materials. By adding chamotte, which is also a recycled brick product, as a raw material, it is a product that works on the effective use of resources. The porous (porous), which is also a characteristic of corzilite, absorbs water and evaporates it, making the steam mild, and you can enjoy a cleaner and more comfortable lauryu than ever before. * Depending on the monitor and PC environment, the color may look slightly different from the actual product. * Some products use images provided by the manufacturer for some product images, so specifications are subject to change without notice.