A. Our humidifier filter is made of natural fabric. The multi - layer mesh surface can increase the moisture output of the humidifier and filter scale. The upgraded material makes the filter more stable and have a better filtering effect, and it can be used for some time. B. It is of relatively good quality. C. Easy installation: Take out the old filter from the humidifier, install this filter in place and adjust it. The filter needs to be replaced every 1 - 3 months during normal use. Please fill the water tank with distilled water or cold water, and avoid using hot water. D. Made of good - quality materials, it is more durable. E. As part of daily maintenance, the filter can be removed and replaced. F. Product name: HWF100 Humidifier Filter G. Type: Filter H. Applicable models: Suitable for Holmes HWF100 - UC3/Bionaire BWF100 I. Quantity: 10 pieces J. Color: Black and white K. Material: Plastic L. Dimensions: 135mm×190mm×30mm M. Package contents: 10 pieces of humidifier filters N. Only the above package contents are included, and other products are not included. O. Precautions: Due to light reflection and different monitors, the color of the item in the picture may vary slightly from the actual product. A measurement error of ±1 - 3 cm is allowed for the dimensions.