The Rasmussen 20" Dark Gray Alterna Ventless Uniform FireBalls Single Sided (AFB20-DG) offer a bold, modern alternative to traditional gas logs, enhancing your ventless fireplace with a contemporary look. Constructed from heat-resistant ceramic-bonded refractory material, these fireballs are designed to withstand high temperatures while providing a sleek, polished appearance. The dark gray finish adds a sophisticated contrast to flames, and their unique design conceals the burner for a fuller look. Specifically compatible with the Rasmussen Alterna Ventless FireBalls Burner (sold separately), this set brings a touch of elegance to your indoor space.