R/T 300 Enclosure Series (318-10 Pioneer) - Single 10" Slot Vented Sub Bass Hatchback Speaker Box with Labyrinth Power Port for Pioneer Subs Made in the USA with premium 3/4" MDF 1.35 Cu. Ft. Air Space/Tuning - 42 Hz Easy Hook Up Terminal Cups Automotive Grey Carpeting 18.0" W x 13.5" H x 15.0" D