Choose Your Style
The MasterBox Q300L is your straightforward option in the MasterBox Q-series from Cooler Master, a series that might be small in size but excels in functionality, modularity, and thermal performance.
The I/O panel can be adjusted to six different locations—on both side of the body you can install the I/O panel at the front, top or bottom.
Magnetic Dust Filters
Patterned magnetic filters create a unique look for your chassis while keeping your system's internals free from excess dust.
Small Form Factor, ATX PSU Support
Despite the Micro-ATX form factor and the body depth/height of only 370 x 370mm, the MasterBox Q300L can accommodate a normal ATX PSU.
Edge-to-Edge Acrylic Side Panel
Show off your build through the full size transparent side panel.
The open design of the perforated front, top, and bottom guarantees excellent thermal performance.
A space 28mm-wide behind the motherboard tray offers open space for hidden cable management.