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I/O panel can be adjusted in 6 different locations and the Case can be positioned: vertical or horizontal
Edge-to-Edge Acrylic Transparent Side Panel offers a full view inside
Body depth height: can support normal size ATX power supply
Front Magnetic Design Dust Filter with open perforated front, top and bottom for high air performance
Extra space behind the motherboard tray for hidden cable management

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.

System Flexibility

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.

Thermal Performance

The open design of the perforated front, top, and bottom guarantees excellent thermal performance.

Routing Space

A space 28mm-wide behind the motherboard tray offers open space for hidden cable management.