Rasmussen 24" Natural Alterna Ventless FireStones Double Sided - DF-AFS24-NA offers a classic, earthy tone for your ventless fireplace, providing a natural look from both sides. Constructed from durable ceramic-bonded refractory material, these firestones are designed to withstand high temperatures, ensuring long-lasting quality without cracking. Ideal for concealing burners, this natural-toned set complements rustic and transitional decor. Compatible exclusively with Rasmussen Alterna Vent-Free FireStones Burners (sold separately).