Acrylic and plastic front panel, 0.8mm steel body Mini-ITX 2 x USB 3.0 / Audio Front Ports Slim optical 12.7mm or 9.5mm x 1 (9.5mm compatibility limited to tray type) (replaceable with 3.5’ HDD x 1, 2.5’ HDD x 2,or 120mm fan x 1) External 5.25’ Drive Bays