Enhance your audio experience with our premium sponge plugs designed for speaker port tubes. These plugs help improve sound quality in bass reflex tubes and loudspeaker woofer vents. Perfect fit for standard bass reflex tubes, providing enhanced sound clarity and bass response. Durable Material: Made from high-quality sponge material, these plugs are built to last and effectively reduce unwanted frequencies. Easy to Install: Lightweight design allows for quick and simple insertion into your speaker's port tube for immediate acoustic improvement. Note: Due to different production batches, slight variations in product appearance and printing may occur. These differences do not affect performance. Size (Diameter x Height): 80x80mm, 63x60mm, 83x100mm, 100x100mm, 72x60mm, 93x100mm Color: Black Material: Sponge Package Contents: 2 x Sponge Plug Note: Light reflection and differences in display screens may cause slight color variations between the product image and the actual item. Measurement error allowed is +/- 1-3 cm.