Compatibility: MA-40 replacement filter is customized for Air MA-40 air purifier, part NO. MA-40-b1 v2.0 MA-40- v2.0 MA-40-w1 v2.0 MA-40-w2 v2.0.Efficient: MA-40 Filter fits your MA-40 air purifier like a glove, helps to maintain its performance. Works powerfully and effectively.Upgraded HEPA: H13 grade true HEPA filter, filters out 99.97% of particles as small as 0.1 Micrometres and air pollution PM 2.5 (particulate matter). Helps to relieve common allergies like sneezing, coughing, and irritated eyes.3 Stage Filtration: Pre-filter captures large pollutants, H13 True HEPA removes fine particles, Activated Carbon Filter absorbs odors and VOC. keeping the air inside your home, apartment, school and office clean.Filter Service Life: 8-10 months (depending on usage frequency).Colour:As shownMaterial:plasticPackage Contents:2 * filterOnly 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.