Piper Doll are a brand underneath the umbrella of Doll Forever, of which DollHouse 168 also sit under.
They are a Taiwanese based company but have factories for each brand in mainland China.
Piper Doll produce dolls with a fixed head, so the heads are not interchangeable.
However, this does mean that there is no seam/gap where the neck meets the head!
So much greater realism.