The Scythe Mugen 4 heatsink weighs 625grams and stands 157mm tall. The heatsink is built around six 6mm diameter copper heatpipes and has a footprint of 130x112mm. A 120mm PWM fan ships with the Mugen 4 heatsink, it rotates at 1400-600RPM and produces upwards of 41.9d dBA.