SilverStone\'s Aero Slots were originally developed for the Prestige case, the Temjin TJ10. These increase the passive thermal properties and improve the ventilation at the back. The standard size of the expansion slots allow the use in any case.Now you can also ask the question: Why should I ever expansion slots provided with apertures - the best ventilation, but where, if I leave out completely? Absolutely right! But the factory-fitted slot covers have a meaning! You could guarantee optimal shielding against EMI emissions, which, if they leak out, affecting other devices in the area and interfere with their functional activity. With the Aero Slots can win 70 percent of air to surface and is immune to EMI.- Length: 120 mm- Weight: 8 grams per piece- Surface (air vents): 890 mm / 70% - Color: black nickel- Compatibility: Standard Expansion Slots- Quantity in package: 4 pieces