Compatibility: This replacement filter set is only compatible with Molekule Air Purifier, not compatible with Molekule Mini, Mini+, or Air Pro. Advanced Filter: Our replacement filter for Molekule Air uses Photo Electrochemical Oxidation technology to effectively capture airborne pollutants and improve air quality. Recommended replacement for average use: every 6 months. True HEPA Filtration System: Features an H13 True HEPA layer that captures 99.97% of airborne particles as small as 0.3 microns, including dust, smoke, pollen, pet hair, and dander. Carbon Pre-Filter: Captures larger particles such as dust and dander, and helps reduce VOCs before they reach the main filter. Recommended replacement for average use: every 3 months. 2-in-1 High-Efficiency Filter: To keep your device operating at optimal performance, replace the filter regularly. (The printed text on the filter may vary, but this does not affect functionality.) Color: Grey Material: Cotton Package Contents: 1 Pack * Main Filter 2 Pack * Pre-Filters Only the items listed are included; other products are not part of this package. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.