Package: Kicker 10C15D4 15" 500 Watt Dual 4-Ohm Comp Car Subwoofer + Rockville RSQ15 Single 15" Subwoofer Enclosure + Sub Box Wire Kit With 14 Gauge Speaker Wire + Screws + Spade Terminals Kicker 10C15D4 15" 600 Watt Dual 4 Ohm Comp Car Subwoofer. Best-sounding, loudest bass for the buck. 4-Ohm single voice coil. Super-rigid, injection-molded cone with 360-degree back bracing High-temp coil wire. Vented pole piece for heat dissipation. Strong steel basket with coil-cooling perimeter venting. Ribbed surround for strength at high excursion Durable Spiralead tinsel leads. Tough, yellow double-stitching on surround. Handy spring-loaded terminals Rockville RSQ15 Single 15" 2.6 cu.ft. MDF Sealed Subwoofer Enclosure Box. Designed for 15" subwoofers. Machine precision cut mounting holes  USA Heavy Duty MDF Construction. Top of the line Glue for extra durable adhesion High quality GOLD spring loaded terminals. Designed, tested, and engineered to work perfectly with high powered subs. Designed to give the best sound quality