General description Electrostatic cotton filters designed for Mi Air Purifier Pro/1/2, these HEPA air purifier filters utilize a 3D acupuncture process that minimizes wind resistance and simplifies cleaning. They effectively extend the filter life by three to five times, making them a cost-effective choice for maintaining air quality. Technical specifications Material: Cotton Size: 68 x 30 cm Package Contents: 40 pieces of electrostatic cotton Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with Mi Air Purifier Pro/1/2 Suitable for air conditioning dust, central air conditioning inlets, windows, and anti-fog applications