These speaker port tubes are perfect for building your own speaker cabinets or replacing old ones, which is an essential part of the speaker cabinet! Used for improved speaker cabinet, portable speaker, home speaker or car speaker. Designed for car , boosting bass effect. Features - Color: Brown -Material:Plastic, paper - Size: 13.00X10.00X10.00cm/5.11X3.93X3.93in -Hole size: 93mm/3.66in -Inner diameter:66mm/2.60in -Made of plastic and paper material for long term use, give you a pleasant using experience. -Fine workmanship and quality craft ensure its durability and practicality. Effective heat dissipation with innovative exhaust vents. -The product is in a simple design, but very useful and practical for you to use. -The perfect workmanship will give you an excellent purchasing and using experience. -Accommodates various speaker, simple and installation process. Package list: 1 x Speaker Port Tube