Cooler Master

Cooler Master MCB-B400L-KGNN-S00 MasterBox MB400L Mini Tower Case

Compact and Stylish Case for Your Next Build The Cooler Master MasterBox MB400L is a mini tower case designed for compact and stylish builds. Featuring a brushed front panel, versatile cooling options, and support for various motherboard sizes, this case provides a sleek and functional solution ...

$69.99*
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*Price sourced from Amazon.com. Last updated:Aug 29, 2026.Price and availability are subject to change — details.

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Overview

Compact and Stylish Case for Your Next Build

The Cooler Master MasterBox MB400L is a mini tower case designed for compact and stylish builds. Featuring a brushed front panel, versatile cooling options, and support for various motherboard sizes, this case provides a sleek and functional solution for your next PC build.

Specifications:

  • Front Panel: Brushed finish
  • Cooling Support: Up to six fans, front, top, and rear radiator support
  • Motherboard Compatibility: Mini ITX, Micro ATX
  • Air Inputs: Large mesh inputs on the front panel

Key Features

BRUSH FRONT PANEL: A brushed finish covers the entire front panel for a sleek, minimalist design.

HEXADON GLEAM: If an optional illuminated fan is installed, the Cooler Master hexagonal logo captures the fan light and emits a glow on the front panel.

AIR INPUTS: Large mesh inputs cover each side of the front panel to provide additional air flow to the system.

VERSATIVE COOLING OPTIONS: The support for up to six fans and the front, top and rear radiator support ensure performance is not compromised.

COMPATIBILITY WITH PLATES - MOM: Mini ITX, Micro ATX.

Specifications

Model
MasterBox MB400L
Case Type
Mini Tower
Front Panel Design
Brushed Finish
Airflow Features
Large mesh air inputs on front panel sides
Cooling Support
Up to six fans, Front, Top, Rear radiator support
Motherboard Compatibility
Mini ITX, Micro ATX
Special Feature
Hexagon gleam with optional illuminated fan

Frequently Asked Questions

The Cooler Master MasterBox MB400L features a brushed finish across its entire front panel, contributing to a sleek and minimalist aesthetic.
If an optional illuminated fan is installed, the Cooler Master hexagonal logo is designed to capture the fan light and emit a glow on the front panel.
This case incorporates large mesh inputs that cover each side of the front panel, providing additional air flow to the internal system components.
The MasterBox MB400L Mini Tower Case supports up to six fans and includes radiator support at the front, top, and rear to maintain thermal performance.
The Cooler Master MasterBox MB400L Mini Tower Case is compatible with Mini ITX and Micro ATX motherboard form factors.