1. High quality synthetic non-woven material, durable. 2. Fine workmanship, 9-layer filter bag, increased suction power. 3. Equipped with a unique self-closing valve and safety net, it has good breathability and filter resistance and can collect a large amount of dirt. 4. This filter bag can capture tiny particles such as dust, pollen and pet dander in the air to prevent the growth of bacteria and keep the air fresh, making it ideal for allergy sufferers. 5. A great accessory to protect your living/study/work environment and make your daily life comfortable, giving you a healthier appearance. Specification: Features: Made of high quality synthetic non-woven material, durable. Refined with 9 layers of filter bags to increase suction power. Equipped with a unique self-closing valve and safety net, it has good breathability and filtration resistance and can collect a large amount of dirt. This filter bag can capture dust, pollen, pet dander and other small particles in the air to prevent