Upgrade your sauna with our 25 lb box of premium peridotite igneous rocks in large size. Perfect for large model sauna heaters, these stones are chosen for their durability and ability to withstand high temperatures. They ensure efficient heating and produce a gentle, soothing heat when water is applied, enhancing your sauna experience. The right stones are essential to avoid safety hazards and damage to your heater, making our peridotite rocks a reliable choice.