This is a low speed 120mm case fan
This is a premium quality 120mm fan that comes with hydraulic bearing that offers high performance, longer lifespan, and silent operation. This is a 2-pin fan and has a rotational speed of 1500 RPM. It generates a high airflow of 56.7 CFM and static pressure of 0.07 In H2O. It is also very quiet in operation and has a maximum noise rating of 23.1 dBA.
The fan kit includes two low speed 120mm x 25mm 5 volt dc fans, two metal fan grills, and mounting screw set Besides two 120x80x10mm fan, it comes with nuts/bolts long enough to mount for your use, also includes a 80mm metal fan guard are used to provide a physical barrier around spinning fan blades to prevent accidental contact with fingers or other objects.
So, if you looking for a low noise quiet 120mm case cooling fan then you won't find anything better than this.