This AeroCool Low Noise Dual Layered Blades Case Fan is a stylish fan with plastic/rubber blades for noise absorption. Patented dual layered blades with noise and shock reduction frame. This DS-140mm Blue case fan includes a 7V Voltage reduction cable for ultra-low speed and quieter cooling. Combination of plastic and rubber aimed to reduce turbulence and noise. The air contacting plane is made of rubber and thus reduces the noise induced by the action of fan blades cutting through the air. Silencer blocks in action. 2-in-1 Silencer block and anti-vibration pad reduce vibration and further reduce the possibility of noise created by the spinning fan. Dimpled surface on the backside of fan blades aims to minimize turbulence and thus reduce the possibility of noise created from the movement of air.