PERFECT FIT: Compatible with for MA-25 B1/S1/W1 Air Purifier. The package includes 2 filters (1 set). HIGH-EFFICIENCY: MA-25 True HEPA Filters are made of 3-in-1 filtration systems including Nylon Pre-Filter, H13 Grade True HEPA Filter, and Activated Carbon Filter. TRUE HEPA: H13 Grade True HEPA Filter helps remove up to 99.97% of particles as tiny as 0.1 Micrometres including pollen , dust, hair and more. ACTIVATED CARBON: The high-grade activated carbon filters can efficiently absorb odors and fume, such as smoke, cooking smells, and pet odors. Colour:black+white Material:plastic Package Contents: 2 * h13 hepa filter Only the above package content, other products are not included. Note: Light 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.