nPowerTek TTIC NPH-101 Pentium4 Heatsink
The large heatpipe (aka heat column) stands 100mm tall, and comes in direct contact with the processor core for optimal thermal efficiency. The hollow copper heatpipe or "heat column," works because of a chemically coated interior surface. The heat column as it called by the manufacturer, produces similar results as that of a heatpipe, which is why we will use the terms interchangeably. The heat absorbed by the copper column of the nPowertek NPH-101 is dispersed to approximately 30 copper fins measuring roughly 70x80mm in size."
[M] version NPH-101 and NPH-1 review