The VSK4000B-U3 is built with durable, SGCC steel, it's a tough case meant to last for several builds without fail. The VSK4000B-U3 also meets Thermally Advantaged Chassis (TAC) 2.0 guidelines and is upgraded with two USB 3.0 ports, nine drive bays, and seven expansion slots. Building a system starts with buying a case, then comes the parts that goes into it, which the cost can add up very quickly. The VSK4000B-U3 is here to provide the basic platform to start building your very own system. Its humble design and practical functionality contains the fundamentals for a performance chassis. The VSK line is designed to be a stepping stone for those who want to upgrade their system later on. Each chassis devotedly serves their purpose as a cost-effective, unforgettable part of your system building experience.