ITEM NAME:1Pc Green Sponge Air Filter 21 x 21 x 11Cm Universal Mushroom Head Shape Hi X8C8 1Pc Green Sponge Air Filter 21 x 21 x 11Cm Universal Mushroom Head Shape Hi X8C8 High-flow air filter reduces the resistance of the engine intake air while increasing the intake air volume and volumetric efficiency per unit time while the engine is running Semi-spherical honeycomb structure, which can distribute the airflow evenly in six directions, allowing the air to form a smooth flow The fan-shaped part of the inner frame is designed The internal funnel-like structure creates a vacuum zone on the inside, which can forcibly inhale air and increase the area of the suction air Universal Mushroom Head Shape High Flow Car Sponge Air Filter colour:Green Material: Sponge size:Dimension: 21*21*11cm (Approx.) Interface Diameter: 100mm (Approx.) Package Contents: 1*Sponge Air Filter.Universal Mushroom Head Shape High Flow Car Sponge Air Filter. Semi-spherical honeycomb structure, which can distribute the airflow evenly in six directions, allowing the air to form a smooth flow. The internal funnel-like structure creates a vacuum zone on the inside, which can forcibly inhale air and increase the area of the suction air.