About us: Our brands and products are always committed to improving a better customer experience. Our products strictly adhere to the concept of green, efficient. Every breath is dedicated to creating a better earth and making our world a better place. Deatils about Our Product Ultrasonic Indentation The indentation adopts ultrasonic technology to make the seam interface of the bag firmer and avoid the debris comes flying out. Inner Paper with Sticker Smooth inner paper with sticker makes the dust more evenly dispersed in all parts of the bag, effectively avoiding clogging. High Quality Material Made of high quality material, which is more durable and not easily tore apart in usual living life. Read more Six-Layer Gradient Design True HEPA H13 Filtration Bags What is a HEPA filter? HEPA is a type of pleated mechanical air filter. It is an acronym for "high efficiency particulate air [filter]" (as officially defined by the U.S. Dept. of Energy) What can HEPA do? This type of air filter can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (µm). Others All air cleaners require periodic cleaning and filter replacement to function properly. Read more