3 Case Pack Kit Solid Virgin Aluminum Subwoofer Speaker Ports with Gorilla Glue Case of 3 Virgin Aluminum Subwoofer Enclosure Port Tubes. Includes Gorilla Glue. (Glue Sizes Will Vary) Fits any Application which calls for Industry Standard 3" x 12" Subwoofer Ports. Ports Measure Exactly 4 9/16" (Front Total Diameter Across) x Inner Diameter 3" x 12" Length 100% Virgin Aluminum. Nickel-Plated Front for High Polish. Ports are Machined and Hand Hammered. Some minor imperfections to the non visible portions may exist due to hand hammering process.