Built with durable, SGCC steel, the VSK 4000B U3 is a tough case meant to last for several builds without fail. The VSK 4000B U3 also meets Thermally Advantaged Chassis (TAC) 3.0 guidelines and is equipped with two USB 3.0 ports, nine drive bays, and seven expansion slots. Technical DetailsModel Brand : Antec Model : VSK 4000B U3 MoTHerboards : Standard ATX, microATX, Mini-ITX 9 drive bays 3 x 5.25" drive bays 2 x 3.5" HDD bays 1 x floppy drive 7 expansion slots Maximum graphics card size : 12.5" (318 mm) Cooling System 1 x 120 mm rear exhaust fan 1 x 120 mm front intake fan (optional) Water cooling support : rear water cooling grommets Sturdy steel frame for durability Front I/O ports 2 x USB 3.0 Audio In/Out Unit Dimensions 17.3" (H) x 7.3" (W) x 16.2" (D) 440 mm (H) x 185 mm (W) x 412 mm (D)