The case specification Factor of Form Material for the Mid-Tower (Front/Side) E-ATX, ATX, and Micro-ATX expansion slots are supported by this tempered glass and aluminum (body) steel motherboard. Eight 2.5" internal bays, six 3.5" internal bays, three No 140mm fans are included. Top: 120 x 3 / 140 x 2 (Option); Side: 120 x 3 (Option); Bottom: 120 x 3 (Option) USB3.1 Type-C x1 HD Audio Case with I/O Interface USB3.0 x2 HD Audio Specification link: https://lian-li.com/product/pc-o11-dynamic-razer-edition/