Rasmussen 24" B/W/LG Mix Alterna Ventless FireStones Single Sided - AFS24-BX features a sophisticated blend of black, white, and light gray firestones, adding a striking contrast to your ventless fireplace. Made from durable ceramic-bonded refractory material, these firestones withstand high temperatures without cracking, ensuring long-lasting beauty. Ideal for concealing burners, this multi-tonal set complements modern and transitional decor. Exclusively compatible with Rasmussen Alterna Vent-Free FireStones Burners (sold separately).