Specifications: The high-flow air filter element can reduce the resistance of the engine's air intake, and at the same time increase the air intake per unit time and the volumetric efficiency of the engine during operation. Semi-spherical honeycomb structure can evenly disperse the chaotic airflow in six directions, allowing the air to flow smoothly. Fan-shaped part of the inner frame is designed with 16 radial-shaped brackets. This structure is relatively tough. If the mushroom head is broken open, the funnel-shaped structure can be clearly seen from the cross section of the arc-shaped bracket. This design creates a vacuum zone inside the mushroom head, which can forcibly inhale air. So that the area of the fan-shaped part is not at all waste, so that the actual suction area becomes larger. Item Name: Air Flow Filter Material: Aluminum, Iron Features: Durable, Fine Workmanship, Easy to install Filter Body Maximum Diameter: 155mm/6.10" (Approx.) Filter Body Minimum Diameter: 118mm/4.65" (Approx.) Connector Diameter: 76mm/2.99" (Approx.) Size: 15.5cm x 15.5cm x 11.8cm/6.1" x 6.1" x 4.65" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Air Flow Filter