The Rasmussen 21" Black Vented Uniform FireBalls - FB21-BL deliver a bold, modern look to any vented fireplace. Made from durable ceramic and finished with a striking black, heat-resistant stain, these fireballs add a sleek, contemporary touch. Their uniform shape conceals the burner for a clean and minimalist appearance. Compatible with Rasmussen Vented Custom Pan Burners (sold separately), these fireballs are a stylish and practical choice for residential and commercial settings.