Premium Sauna Stones (5-10cm) Engineered from olivine diabase, these premium sauna stones deliver exceptional heat retention and thermal stability for superior sauna performance. The 5-10cm form ensures optimal airflow through your heater while minimizing dust and degradation. Naturally dense and durable, olivine diabase withstands repeated thermal cycling without cracking or spalling. Ideal for both traditional and modern sauna systems, these stones provide consistent, long-lasting heat distribution that enhances your sauna experience. Replace every 2-3 years depending on usage frequency for peak efficiency.