PC Gaming ATX, ITX, micro ATX Supported HDD sizes: 3.5" Number of 2.5" bays: 2 Number of 3.5" bays: 2 Side window Tempered glass panel(s) Aluminium, Steel White Jonsbo team has been trying to provide users with a solid material and moderate price ATX full aluminum shell case, limited by the high cost of aluminum we have not been able to achieve this desire. The rapid popularization and reducing price of SSD bring us the opportunity for the development of U4, by reducing the amount of 3.5 HDD support and cancelling the optical drive rack, under condition that the compatibilities of high-end hardware are not affected, Jonsbo team has created a middle-level full aluminum ATX case for users. U4 can support 170mm height CPU radiator, 310mm length high-end display card and 120/240mm cooler. In materials, U4 keeps the same level with high-end case, 2mm thickness aluminum plate is used for the shell, 1.0mm SGCC steel plate is used for the structure, and 5mm thickness full tempered glass is use