2Pcs 52.8mm x 52mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Box Vent Linear Ball Bearings Size: 3-Inch x 21-Inch /

Size: 3-Inch x 21-Inch / 75mm x 533mm (Width*Girth)

Material: Aluminum alloy construction

is an ideal fastener for kinds of hoses

8 inch (D*L)

2Pcs 52.8mm x 52mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Box Vent Linear Ball Bearings Size: 3-Inch x 21-Inch /Features: Speaker Port Tube is used to improve the bass response of many types of speakers. There are plenty of types to help you with your vented box design, and carries tubes of every shape and size, including adjustable length ports and flared ports. These port tubes are a reliable, convenient installation, while at the same time providing a finished, "pro" look to your bass reflex speaker building project. Normal tubes suffer from nasty turbulence