Rasmussen 30" B/W/LG Mix Alterna Ventless FireStones Double Sided - DF-AFS30-BX features a stylish mix of black, white, and light gray firestones, creating a striking contrast on both sides of your ventless fireplace. Constructed from durable ceramic-bonded refractory material, these firestones are heat-resistant, providing long-lasting quality without cracking. Ideal for concealing burners, this multi-tonal set complements modern and transitional decor. Compatible exclusively with Rasmussen Alterna Vent-Free FireStones Burners (sold separately).