Convenient 4-pack of SPH412-A Scroll Design Floor Register for a cohesive look throughout your home; 4x12 Inches size with a Antique Brass Finish finish enhances airflow while complementing your decor Easy to install - Just drop into vent - no tools required Metal damper boxes rust and seize up, so we make our damper boxes with recycled high impact polystyrene; this is not a cheaper option, it’s the best option Crafted for long trouble free operation Filter retainer and filter are sold separately