Feature: 1. Enhanced Sound Quality: The port tube sponge effectively reduces speaker vibration, minimizing wind noise and buzzing sound, improving mid low frequency, providing better bass effect for speakers, enhance low frequency response. 2. Versatile Usage: The air port sponge is compatible with upgraded speakers, speaker cabinets, home speaker, car speaker, portable speakers, PA or DJ subwoofers. Ideal for bass air ports on speaker cabinets. 3. Wide Compatibility: The air vent port tube sponge features 65mm diameter and 60mm height. Choose sponge size based on inner diameter of speaker port to ensure secure fit. 4. Premium Sponge Material: Made of high strength sponge material, this replacement sponge is sturdy and robust, resisting daily wear and tear, ensuring long lasting use. 5. Easy Installation: Simply insert sponge into speaker port for immediate improvement in sound quality and bass response. According to the size of the inner diameter of the speaker port tube to choose the diameter of the sponge you need, the diameter of the sponge is slightly larger than the inner diameter of the speaker port tube 5mm, the larger sponge can be stably stuck in the speaker port tube. Specification: Item Type: Speaker Port Tube Sponge Diameter: Approx. 65mm / 2.56in Height: Approx. 60mm / 2.4in (Manual measurement may have error). Package List: 2 x Speaker Port Tube Sponge Note: The sponge is produced by stamping process, and the product size may have slight errors, which is normal.