Features: Engineered with precisions tuned bass reflexes tubes to enhances low frequency response, reduce distortion, and deliver powerful, clear sound output for professional speakers systems. Constructed from reinforced composite paper with smooth inner wall, this acoustics tuning port minimizes airflows while maintaining structural durability for consistent sound performances. for audiophiles, speakers builders, and professional sound engineers seeking customizable vent tube solution to optimize cabinet air interaction home theaters, studio monitors, or car sound systems. Perfectly integrates with speakers enclosures during acoustics upgrades, studio installations, or automotive sound systems modifications, ensuring airtights seals through precisions molded coupling designs. Features toolless length adjustment and multiple diameter option (customizable upon request), making it essential for achieving targeted bass resonance frequencies in ported speakers designs. Specifications: Materials: Thickened paper Size:88X160mm,70X200mm,50x100mm,40X103mm,72x118mm,76X118mm(optional) Package Includes: 1PC speakers Vent Tube note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.