Using a dual frame construction, Spectre Pro LED fans not only offer aggressive looks, but also vibration dampening properties, helping to keep noise levels in check. In short, our Spectre Pro LED Fan Series looks different because it is. * Engineered for maximum pressure and airflow, Spectre Pro LED delivers a torrent of air that will keep your system cool even when the action heats up. Performance freaks and water cooling enthusiasts are going to love Spectre Pro. * High rotation speeds can actually warp fan blades while in motion, resulting in more turbulence and noise. Spectre Pro LED features reinforced fan blades that resist warping even when spinning at high speeds for maximum cooling performance. * All the airflow in the world won"t do you any good if it can"t reach your system"s hotspots. The special curved design of Spectre Pro LED fan blades and cage directs airflow in a focused column, minimizing diffusion and allowing cool air to reach your components. * Like our SpectreTM LED Silent Fan Series, our Spectre Pro LED features the very same fluid dynamic bearing technology for minimum noise and maximum operating life.