Strong Magnet: The CANOPUS magnetic vent sheets can cover most standard metallic vent grills. They are made of high-quality material. Due to the sheet thickness, they have a sufficiently strong magnetic force to stay put on the steel register plate. Its mission is to cover the vent grill and to block excessive and disturbing airflow. When no airflow is present it will serve as a strong cover and stay in place for months and prevent any dust or other particles from passing through. Easy to Use: The CANOPUS magnetic sheets have an astonishingly simple look and design. The material is bending for the best user experience. It is extremely simple to use it: just take it out of its pack and place it on the vent grill. You can remove small dents off the sides to match the vent handle, if necessary. Adjustable: The CANOPUS magnetic vent covers will keep your rooms warm in winter times and cool in the summer, as expected. They will reduce the excessive blowing air in your baby’s room, your bathroom, or your kitchen. They can be cut to the desired size, repainted, and/or wallpapered as needed to match walls or room decoration Package Content: 3 magnetic vent covers, Rectangular Size: 8in-by-15in., Thickness: 0.08in (2mm). Canopus magnetic vent covers keep rooms warm in the winter and cool in the summer. They can be cut to the desired size, repainted, and/or wallpapered as needed to match walls or room decoration.