Enhance your audio experience with our premium sponge plugs designed specifically for speaker port tubes. These plugs are essential for anyone looking to improve the sound quality of their bass reflex tubes and loudspeaker woofer vents. for standard bass reflex tubes, ensuring enhanced sound clarity and bass response. Material: Made from high-quality sponge, these plugs withstand regular use while effectively dampening unwanted frequencies. Easy to Install: Simply insert these plugs into your speaker's port tube for immediate sound improvement. Due to different batches, there may be differences in product appearance and printed text, which not affect use. Size(Diameter x Height):53x50mm Colour:Black Material:sponge Package Contents: 2 * Sponge Cotton Plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!