Features 1、Increase the intake air flow, filter impurities in the air, and make the engine breathe more smoothly. 2、Unique shape reduces the resistance of the engine intake air, improves the intake air volume and volumetric efficiency per unit time when the engine is running. 3、Prevent the dust suspended in the air from being sucked into the cylinder and reduce the wear of the piston group and cylinder. 4、Installed in front of the carburetor or intake pipe to filter out dust and sand particles in the air , ensures that enough clean air enters the cylinder. 5、Easy to install, no complicated tools required, easy to use. Specifications: Condition: 100% Brand New Item Type: Air Filter Material: Nonwoven Fabric Optional Color: Red, Blue, Silver, Black Connection Thread: None Seal Ring Size: None Interface Inner Diameter: Approx. 13mm/0.5in Applicable Models: Universal Interface Outer Diameter: Approx. 20mm/0.8in Size: Approx. 50 x 58mm/2 x 2.3in Type: Intake Air Filter Outlet Diameter: None Category: Small Mushroom Head Applicable Gearbox Type: MT/ Manual Transmission Package List 1 x Air Filter 1 x Clamp