<ul><li>APPLICATION OBJECT: With 52mm inner hole diameter, it is suitable for 6-8 inch speakers, subwoofers, etc.</li><li>SIZE MATCHING: The opening hole is about 72MM in diameter, helping to make the airflow more smooth.</li><li>SPEAKER PORT TUBES: Speaker inverting hole, also known as sound tube and air hole, often used in inverting type speakers.</li><li>BASS BOOSTER TUBE: It is mainly to overpower the air flow sound of the speaker vibration in the box and overlap the sound pressure of the radiation in front of the speaker to produce a bass effect.</li><li>GOOD MATERIAL: Made of high quality material, this product is sturdy and durable.</li></ul><br><br>Specification: Item Type: Inverter Tube Total Length: Approx. 118mm / 4.65in (as shown in picture) Open Hole Diameter: Approx. 72 mm / 2.83in (as shown in picture) Inner Hole Diameter: Approx. 52mm / 2.05in Package List: Inverter Tube x 2

Speaker Port Tubes for Bass Enhancer, Subwoofer Air Ports Repalcement & DIY Parts 72mm x 118mm Speaker Cabinet Port Tube, 2-Pcs