The Zalman CNPS11X Extreme heatsink is equipped with one 120mm PWM fan that rotates at 1000-1950RPM and moves air through a pair of thin aluminum fin towers set at 80-degress to each other. Five 6mm diameter composite wick heatpipes conduct heat from the copper base plate to the twin 100mm fin stacks. Zalman use composite copper heatpipes on the CNPS11X Extreme heatsink; this type of 6mm diameter heatpipe contains a dual wick structure of grooved and sintered metal that makes them more efficient at conducting heat than a typical metal mesh wick.