Accord AMAGCOV815 Magnetic Vent Cover, 8-Inch x 15-Inch, 3-Pack Works with ceiling and wall registers; Not for use on return air grilles Sticks to steel registers only; Not for use on aluminum, painted, plastic or wood registers Cuts easily with scissors for a custom fit Register face plate not to exceed 14" X 6" Must cover the entire surface of the register face plate to adhere properly