Genuine Harvia sauna stones are selected according to old traditions and convey a genuine sauna atmosphere. Harvia sauna stones provide good and soft heat. Split-face sauna stones are the only correct stones for electric heaters and woodburning stoves because they can store lots of heat and the water evaporates efficiently from the wide surface of the fracture. Angular split-face stones also allow for loose placement of the stones, which is the most important requirement, particularly in electric heaters in order to make it possible for the heat to be conveyed to the sauna room between the hot stones and heating elements. Good air circulation in the stone space makes the electric heating elements last for as long as possible. CAUTION: Light (ceramic), soft (soapstone), and smooth (rounded) sauna stones do not produce the desired results and they may cause problems in electric heaters in particular. Only available with the purchase of a Harvia sauna heater or stove. Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply). Durable with high-heat capacity Stones range from 2" to 4" (5-10 cm) To ensure optimal performance and safety, each sauna heater requires a specific number and size of stones. Refer to the guide below. Cilindro- 6kW, 8kW, 9kW - 200 lbs (91 kg), 2-4" (5-10 cm) - 5 × 44 lbsCilindro- 10.5kW - 264 lbs (120 kg), 2-4" (5-10 cm) - 6 × 44 lbsClub- 10kW, 12.5kW, 15kW - 132 lbs (60 kg), 2-4" (5-10 cm) - 3 × 44 lbsKIP- 3kW, 4.5kW, 6kW, 8kW - 44 lbs (23 kg), 2-4" (5-10 cm) - 1 × 44 lbsThe Wall- 6kW, 8kW - 44 lbs (20 kg), 2-4" (5-10 cm) - 1 × 44 lbsTopClass- 4.5kW, 6kW, 8kW - 44 lbs (20 kg), 2-4" (5-10 cm) - 1 × 44 lbsVega- 1.7kW, 1.9kW, 3.5kW - 29 lbs (13 kg), 2-4" (5-10 cm) - 1 × 44 lbs