The Rasmussen 21" Natural Vented Uniform FireBalls - FB21-NA offer a minimalist and modern look for vented fireplaces. Crafted from durable ceramic and finished in a natural tan-gray hue, these fireballs are heat-resistant and eco-friendly. Their uniform shape is designed to conceal the burner, providing a clean and sleek aesthetic. Compatible with Rasmussen Vented Custom Pan Burners (sold separately), these fireballs are ideal for both home and commercial spaces, creating a contemporary atmosphere.