4Pcs 4 Inches x 6 Inche Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Recessed Pull Handles * Granularity: 5000/10000 Grits

* Granularity: 5000/10000 Grits

Operating temperature:0 - 60 Degree Celsius

* Input Voltage Range: 38-60V DC

3-inch x 2

Inner Diameter: 60mm/2

4Pcs 4 Inches x 6 Inche Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Recessed Pull Handles * Granularity: 5000/10000 GritsFeatures: 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