Features 1、1.For filtering air at home. 2、2.Protect people from harmful gas. 3、3.High quality and durable for long term use. 4、4.The filter screen is made up of initial cotton, activated carbon particles and cold catalyst. It can filter particles above pm50 and block dust while blocking hair. 5、5.The activated carbon particle layer can effectively adsorb organic compounds such as formaldehyde, toluene, hydrogen benzene and odor in the air. Features: 1. For filtering air at home. 2. Protect people from harmful gas. 3. High quality and durable for long term use. 4. The filter screen is made up of initial cotton, activated carbon particles and cold catalyst. It can filter particles above pm50 and block dust while blocking hair. 5. The activated carbon particle layer can effectively adsorb organic compounds such as formaldehyde, toluene, hydrogen benzene and odor in the air. 6. The cold catalyst has a strong catalytic degradation function, which can degrade formaldehyde organic matter into carbon dioxide and water,and has the effect of killing Escherichia coil and staphylococcus aureus. 7. Adding this filter net in front of the HEPA filter net greatly extends the life of the HEPA filter Specifications: Material: Initial cotton,activated carbon particles,cold catalyst Fit for Nobico air purifier j020/j021 Size: Approx. 11*11*2.2cm/4.3*4.3*0.86inch Package list: Filter*1 Filter cotton*1 Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List