BambooMN 4" Inch x 9 7/8" Inch Strand Woven Bamboo Floor Register Air Vent Indent Cover - Carbonized Brown - 1 Cover 1x - BambooMN brand bamboo floor register air vent covers are easy to install Outer Dimensions: 6" Inch x 11.8" Inch - Inner Dimension: 4" Inch x 9 7/8" Inch Finish: Carbonized Strand Woven All natural - 100% Bamboo (Panda Safe - not from the bamboo that pandas eat)