The Zerotherm Zen FZ120 is a conventional, high performance, tower heatsink — it has four U-shaped heatpipes, tightly packed fins, and a 120mm PWM fan attached via wire clips. It sports a few curves and contours reminiscent of the BTF80/BTF90 "butterfly" coolers (which were quite good)... but the sheer size of the new Zen makes it a more serious contender.

http://www.silentpcreview.com/article849-page1.html