Includes: 6x12 inch rubber vent covers (Qty 3). Does not include metal vent. Size Selection 1) Remove vent 2) Measure back of vent 3) Back of vent must measure Width: 5.5 to 6 inches Length: 11.5 to 12 inches Blocks vent airflow and redirects air to other rooms to improve home comfort. Eliminates vent noise Compatible with all material types (metal, plastic, wood, painted). The vent cover utilizes custom engineered tear resistant rubber. Easy to install and completely hidden from view. Use on floor, ceiling,and sidewall vents. Not for use on return air vents. 100% money back guarantee!!