Cooler Master Q300L MCB-Q300L-KANN-S00 Cabinet (Black) The master box q300l is your straightforward option in the line-up of the brand new master box q-series from cooler master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldn’t tell, the master box q300l supports a standard atx push which we don’t see often in the market with this size. Based on the different systemsetup, the i/o panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best. Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the master box q300l the perfect choice for office and home usage.