General description Boost air to the rooms you need while blocking air in unoccupied rooms with these 5Pcs Magnetic Vent Covers. Save money by heating and cooling only the rooms you use. These covers create a complete seal by conforming to the vent damper, ensuring no air escapes. Technical specifications Size: About 30.5 x 14 cm Material: Soft magnetic Color: White-Black Compatible with steel vents sized 5.5 inches to 5.75 inches wide and 11.5 inches to 12 inches long Measurement allowed error: +/- 1-3 cm Other information Package Contents: 5 Magnetic Vent Covers Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product.