Magnetic Vent Cover is made of material, high temperature no deformation, flame retardant. Compatible with 4inch x 12inch metal regulators, air vents and air conditioning vents. Note: Please measure the vent size before purchasing to avoid purchasing the wrong size. The ly upgraded floor vent cover magnetic strip is thick and has 30% more magnetic force, which can firmly grasp the metal vent to prevent shifting and sliding. Even if the pet jumps from a high place, the floor vent cover still be secure. With reasonable mesh design, this Floor Vent Magnetic Cover helps prevent small objects such as blocks, hair, jewelry and snacks from falling in, thus keeping the ventilation system clean. The Floor Register Vent Screen can assist you in keeping unwanted small creature such as spiders mosquito or out. Specifications: C 4 packs Color: As Shown Material: Rubber+Iron Package Contents: 1 set * magnetic vent covers for floor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.