Feature(may vary by option.)

●HIGH PERFORMANCE: The air flow through the intake tube is very smooth and does not create disturbing turbulence at the inlet and exit of the port like a regular orifice tube would. Greatly improves the noise of the airflow.
●FUNCTION: The function of the worn tube is mainly to evacuate the sound pressure of the vibrating air flow in the enclosure forward and radiate the sound pressure in front of the speaker, thereby producing a bass effect.
●APPLICATION: The inverted port of the speaker is also known as sound duct and air hole, usually used in inverted speakers. Unnecessary noise and poor sound quality are avoided. Let yourself experience beautiful, low distortion and excellent overall sound quality.
●EASY TO INSTALL: It fits 4 to 6 inch speakers. Standard mounting holes make this tube easier to install than other tubes on the market. Please check the installation dimensions before purchasing.
●HIGH QUALITY PLASTIC: The speaker port tube is made from selected ABS plastic material, strong and durable. It has a smooth inner wall and is designed with flared ends. The port tube is reliable and easy to install.

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Description

Specification:
Item Type: Speaker Air Tube
Total length: approx. 141 mm/5.6 inches (as the picture shows).
Speaker housing opening diameter: approx. 50mm/2.0 inches (as the picture shown.)

Package list:
2 x inverted tubes