Page "Brokkr" Paragraph 3

Eitri succeeded in making the golden ring Draupnir, the golden-bristled boar Gullinbursti and the hammer Mjöllnir.

These objects were judged by the gods to be superior and Brokkr won the bet.

However, Loki did not allow him to take his head as doing so would have damaged his neck which was not included in the bet.

In lieu of this, Brokkr sewed Loki's lips so that Loki would not brag until the thread came out.