USB extender base is glued to the top. The Thermaltake Core V21 Black Extreme Micro ATX Cube Chassis CASE ONLY is a sleek and compact Micro Tower Case designed for MicroATX form factor motherboards. Made of durable steel, this black chassis features a unique cube design that allows for easy cable management and airflow optimization. With front ports for USB and audio connectors, this Thermaltake Core V21 case is perfect for building a high-performance gaming or workstation setup. Designed by Thermaltake, a trusted brand in computer components, this case is ideal for those looking for a stylish and functional housing for their system components.