Thermaltake Urban R31 Windowed Mid-Tower Chassis Cases CA-1A7-00M1WN-00 Case Type: Mid Tower Material: SECC External Bay: 3x 5.25" (1x 3.5",?Converted from one 5.25" drive bay) Internal Bay: 6x 3.5" or 1x 2.5" HDD Docking: 1x 3.5" or 2.5" Expansion Slots: 7