iStarUSA D400-6SE-B6SA-BL Material of Front Bezel: Aluminum alloy Material of Handle: SECC Zinc-Coated Steel Material of Main Chassis: 1.2mm SECC Zinc-Coated Steel ( Japan Made ) 4U Rackmount Compact Stylish Server Chassis 2 External 5.25 Motherboard Compatibility: 12 x 9.6 (ATX, MicroATX) External 5.25 Drive Bays: 2 External 3.5 Drive Bays: 2 Hot-Swap Drive Bays: 6 Internal 3.5 Drive Bays: 2 Expansion Slots: 7 Front Ports: 2 x USB 2.0 80mm Fans: 1