iStarUSA Group 3U MATX 5xHS 3.5" Chassis Silver Trayless (D-350HN-T-SILVER) Motherboard Size: 12 x 9.6 (ATX, microATX) Standard Drive Bays: 3x 3.5" Drive (internal), 5x 3.5, Slim 5.25" Expansion Slots: 4 Material: Aluminum, SGCC 0.8mm Front Connector: 2x USB 3.0 Cooling Fan: 2x80mm