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):42x65mm Colour:Black Material:sponge Package Contents: 4 x 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.