[Activated Coconut Carbon]Activated carbon filters are make of natural coconut shells, have large porosity and high specific area (over 1200 square meters per of specific area). It can effectively adsorb odors and particles. [Working Principle]This filter uses the air flow pressure difference formed above and below the blades when the ceiling fan is work to adsorb harmful particles in the air. For example, dust, pollen, pet dander, smoke, etc. [Easy to Install, Never Fall off]Our adhesive is a simple peel-and-stick strong adhesive, fast, easy and strong installation. TIP: Make sure the ceiling fan is clean, dry and free of dust and grease before attaching. [, Invisible]The 0.4-inch ultra-thin invisible upgraded design allows you to say goodbye to bulk of traditional cotton ceiling fan filters. Air passes through the coconut carbon filter, which does not affect the speed of the ceiling fan and can maintain its aesthetics. [ Easily]Traditional air purifiers and HVAC systems are expensive. Opening windows for ventilation is weather limited and time-consuming. Our innovative coconut shell carbon filters are cost-effective, time-saving, simple and efficient, suitable for everyone who wants to improve indoor air quality. size: 25 x 9cm Material: non-woven fabric colour: black Package Contents: 5 x Ceiling Fan Filter 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.