Rasmussen 20" B/N/AR Mix Alterna Ventless FireStones Single Sided - AFS20-BNR showcases a captivating blend of brown, natural, and adobe red firestones, creating a warm, multi-tonal look for ventless fireplaces. Crafted from durable ceramic-bonded refractory material, this set is designed to resist high temperatures, ensuring lasting quality without cracking or popping. Ideal for concealing burners, these firestones add an earthy, transitional style to any living space. Exclusively compatible with Rasmussen Alterna Vent-Free FireStones Burners (sold separately).