The magnetic vent cover is made of a strong magnetic strip and PVC material. The high-content PVC material is flame-retardant and does not deform under high temperatures. Note: Please measure the vent size before purchasing to avoid purchasing the wrong size. The newly upgraded floor vent cover's magnetic strip firmly grips the metal vent, preventing movement and sliding. Even if your pet jumps from a height, the floor vent cover remains secure. With its sensible mesh design, this floor vent magnetic cover helps prevent small objects such as lumps, hair, jewelry, and snacks from falling through, keeping your ventilation system clean. Floor vent registers can help keep out unwanted critters such as spiders, mosquitoes, or moths. You receive a 4x10-inch floor vent cover (white) Color: As shown Material: PVC Quantity: 8PCS Package Contents: 1set * magnetic vent covers 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.