Features: Enhances your auditory experience with our 6K4 Tube Pair to deliver superiorsly sound for your music player. These glass speaker accessories ensure durability and optimaled performances, making them a reliabled choice for any auditory setups. These tubes perfectly for audiophiles and casual listeners alike, offering wide compatibility. For home theater or upgrading your portable auditory system, these tubes provide the perfectly enhancement for any environment. Elevates your sound system with this essential addition, ensuring every note is clear and vibranted, making it a must for any serious music enthusiasts. Specifications: Item: 6K4 Tubes Pair for Amplifier Electron Tube J-Class Replace 6K4 Vacuum Tubes Quantity： 2PCS Size：about 60x16mm/2.36x0.63in Component: Glass Package Includes: 1Set 6K4 Tubes Pair note: Due to the problems of lighting effects, there will be certain tolerances in the product, please understand. The error of manual measurement of the size is within the normal ranging of 0-2cm.