25lb Box of Replacement Sauna Heater Rocks provides a reliable refresh for maintaining strong, consistent performance in most electric sauna heaters. Crafted from premium peridotite igneous stone, each piece is chosen for its ability to endure continuous high heat without fracturing, helping protect heater elements and preserve airflow through the rock cavity. These stones store thermal energy effectively, releasing it steadily to create gentle, even steam when water is applied. Their natural density and varied contours allow for secure stacking, supporting efficient heat transfer and preventing hot spots that can shorten heater life. With a full 25 pounds of durable material, this box offers a convenient way to replace worn or cracked stones and restore the smooth, comforting warmth essential to a balanced sauna environment. Ideal for routine upkeep, 25lb Box of Replacement Sauna Heater Rocks helps ensure dependable heating and a consistently pleasant session.