Rasmussen 20" Natural Alterna Ventless FireStones Double Sided - DF-AFS20-NA offers a timeless, natural tan tone to your ventless fireplace, enhancing it from both sides with a classic look. Crafted from durable ceramic-bonded refractory material, these double-sided firestones are heat-resistant, ensuring 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).