1. Prevent particles from being sucked into the fan to break the fan blades and set off pointless losses; 2. It can also stop people from getting harm after inhaling unintentionally; 3. Prevent grime from getting into and keep far from dirt from moving into the fan 4. Applicable: Any fan function equipment, radiator/chassis/power supply, etc. Before purchasing, please confirm the scale of the put in fan Use range: indoor -10℃~+55℃ Dust removing rate: 89% Protection level: IP40 colour: black Material: ABS size: 120mm Package Contents: 2 x 120mm Dust filters Only the above kit content, other item will not be included. Note: Light shooting and various reveals may cause the color of the object in the photo just a little varied from the genuine thing. The length allowed error is +/- 1-3cm.