This bass reflex plug is an essential tool for your speaker's performance. By blocking the port tube, it helps to control the airflow and reduce unwanted noise, resulting in a more accurate and refined sound. The sponge material ensures a fit and durability, making it a must-have for any enthusiast. Features -Color:Black -Material:Sponge -Size:5.30X5.30X5.00cm/2.08X2.08X1.97in -Noise and vibration reduction: the sponge plug minimizes wind noise, providing a better listening experience -Bass reflex: enhance the bass response of your speakers with the sponge plug for richer, deeper bass -Quick installation: simply insert the sponge plug into the speaker's air vent and guide hole for easy setup -Multiple uses: ideal for home speakers, car speakers, portable speakers, subwoofers, and upgraded speaker systems -Fits various ports: compatible with speaker port tubes, bass ducts, and speaker cabinet port tubes Package list: 6 x Speaker Port Tube Sponge Plug