Cooler Master Cosmos ATX Full Tower Case Silver - (RC-1000-KSN1-GP) Tool-free Structure Patented finger pressing buttons for quickly maintaining or upgrading 5.25" drive devices Detachable aluminum HDD trays for quick maintenance and upgradeability 120 mm bottom fan provides the maximum airflow and air pressure Using negative pressure effect, removable wind tunnel can provide cool air flow for graphic card installed on Motherboard