Cooler Master Each element of the MasterBox MB600L was created from an elegant palette. With a brushed finish, subtle hue, and the minimalistic Cooler Master hexagon, this ATX PC case decorates the gaming setup and workspace while also being able to house the latest hardware.The Cooler Master hexagon on the front panel relays light from optional, illuminated fans. If an optional RGB or ARGB fan is installed behind the front panel, the hexagon will capture light from the fan and emit a glow on the front panel.