This is a Dr. Oetker 5 cm cake ring made in Germany
The white plastic ring is stamped in red with the Dr. Oetker name and other information in German.
We translated one side of the box and it reads "Cake ring made of plastic, food safe, tasteless, dishwasher safe, can be adjusted to all standard cakes".
This ring measures 2" wide and 34" long not including the 3.75" adjustment band.
It is in very good pre-owned condition in the original worn box.