This medium sized brooch with wolf heads is a replica from archaeological finds from Iceland during the Viking period.
These penannular brooches, also called horseshoe or fibulas, were used to close garments or fasten all sorts of material, but mostly fabric. Medium sized brooches like this one were mostly used to close cloaks, for example on the shoulder. The ends of the brooch and the needle are decorated with wolf heads to prevent the needle from sliding out.
The wolf head fibula has a diameter of 5.5 cm, the needle has a length of 8 cm. It is available in bronze, as well as a silver-plated version.