The Thermalright Silver Arrow is a dual tower, dual 140mm fan heatsink for performance and lower noise Intel / AMD processor cooling. It's constructed around four 8mm diameter sintered metal wick copper heatpipes and thin, multi-winglet nickel plated aluminum fins. The end result is +165mm tall and boxy for sure, but it's also a heatsink that can comfortably operate at scarcely a whisper or ramp up its twin 140mm PWM fans to tackle performance cooling situations.