Add this optional modular port enclosure for an extra 6dB bass extension to your TXTRB10 subwoofer enclosure. Features: Roadkill-Armor Coat Permanent Heat Bonded EPM enclosure coating (Elastomeric Polyurethane Molecule) Weather-Resistant for harsh outdoor environments Sound Dampening Properties for resonance reduction Scratch, Crack, and Peel-Resistant Chemical and Stain-Resistant Impact Absorption UV Protection Provides Leak and Corrosion Prevention Heavy Duty 11-Layer High-Density Plywood Construction Durable, Coated Steel Subwoofer Grill for Extra Protection Includes all mounting hardware.Stinger TXTRB10BB Add-on Extension Port For TXTRB10 10-inch Subwoofer Enclosure For Full-size Trucks And Other Vehicles. Permanent Heat Bonded EPM enclosure coating. Weather-Resistant for harsh outdoor environments. Sound Dampening Properties for resonance reduction. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Subwoofers". The seller is "creative-car-audio" and is located in this country: US. This item can be shipped to United States.