Cam belt, also known as a timing belt.
Genuine Porsche
Manufacturer varies, but your belt will be Contitech, Goodyear, Gates, Dayco, CRP, or Pirelli.
ONLY for 16v engines
Fits:
944S 87-88
S2 89-91
968 92-95
Reference/Interchange Numbers:
94410532302/944.105.323.02