1.Perfect Product: You will receive 2 duct filter net covers with a diameter of 4", each of which is durable. The two-pack set makes it easier for you to clean and replace. 2.Elastic Band Design: Our grow tents vent cover does not use the hook and loop tape connection method, but is equipped with elastic bands and fixed buckles, which can automatically adjust the size of the opening according to the needs, and it is more firmly fixed at the vent without falling, allowing your plant tent to keep clean and of dust. 3.Multifunction: The mesh holes on our grow tents vent filter cover are of appropriate size, not only will not hinder the ventilation of the plant tent, but also can effectively dust-proof and ensure that insects, spiders, etc. do not enter the inside environment, and protect your plants from damage and can grow ily. 4.High- quatity Material: Our duct filter net covers are made of waterproof and durable oxford cloth, so you don't have to worry about it being damaged in the humid environment of your plant tents. The net in the middle is made of high-quality plastic and has no peculiar smell. Its elastic band is made of nylon rope for more durability. You can use it for a long time.