Material : 4.5mm aluminum unibody frame, 0.8mm steel body Motherboards : SSI CEB, ATX (maximum 12” x 11”), Micro ATX Dimension : 212mm (W) x 497mm (H) x 616mm (D) Expansion Slots : 7 Drive Bay (External): 5.25 x 5 Drive Bay (Internal): 3.5 x 5, 2.5” x 1 Special Feature: With window side panel, Revolutionary 90 Degree Motherboard Mounting, Foam Padded Interior For Advanced Noise Absorptio, Compatible with expansion card up to 12 inches