All aluminum alloy profiles, strong and durable, full protection of graphics cards and electronic devices, can be firmly superimposed Included motherboard power switch saves you the hassle of manually jumping the motherboard with wires and tools that expose your machine to danger, supports up to 2 PSU power supplies Adjustable holder frames make it fits any size of video cards. Supercooling design for heat dissipation. Significantly increase the distance between the graphics cards Stackable and durable. Side and clear bottom panels provide full protection of GPUs and other electronic components Item DOES NOT include Fans. Supports 5 x 120mm fans . However, fan mounts and brackets are provided in case you need to install fans.