Thermaltake CA-1D5-00S1WN-00 Core V21 Cube Case, 3 x 3.5’’ or 2.5” , 3 x 2.5’’, 5 Expansion Slots, 200mm front included intake fan, USB 3.0 x 2, HD Audio x 1, Mini ITX/Micro ATX, Black. As the latest addition to the Core V Series, the new Thermaltake Core V21 is a quadrate micro M-ATX-based chassis that offers an endless stackable and flexible thermal solution.