93mm x 135mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 2pcs Tape The installation is suitable for

The installation is suitable for solid walls and concrete walls

Stainless steel plate is not easy to fold

Inner Diameter x Outer Diameter: 17

This Cylinder features: 25m bore and 150mm stroke

Applicable to all kinds of hanging windows and casement windows

93mm x 135mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 2pcs Tape The installation is suitable forFeatures: 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