This is an Unreal Asset that was meant to be part of a bigger program that procedurally generated hair but was abandoned and sold as a single Demo asset. It's still useful because you can use the shader along with your own masks to create different hair styles from it, or learn how they did it themselves.
Realtime Hair model UE4 Demo scene, Hair model was generated using GMH2 hair script, package including:
Demo UE4 project ( version 4.21)
custom UE4 Hair shader ( with wind animation and depth fake effect )